Let's denote the total land owned by the farmer as \( T \) and the cleared land for planting as \( C \). We are given that \( T = 6999.999999999999 \) acres.

We are also given that 20% of the cleared land was planted with potato, 70% with tomato, and the remaining 630 acres with corn.

Let's express the cleared land planted with potato as \( 0.20C \), with tomato as \( 0.70C \), and with corn as \( 630 \) acres.

The total cleared land \( C \) is the sum of the land planted with potato, tomato, and corn:

\[ C = 0.20C + 0.70C + 630 \]

Combining the percentages, we get:

\[ C = 0.90C + 630 \]

To find the cleared land \( C \), we need to isolate \( C \) on one side:

\[ C - 0.90C = 630 \]

\[ 0.10C = 630 \]

Now, we can solve for \( C \):

\[ C = \frac{630}{0.10} \]

\[ C = 6300 \]

Now that we have the cleared land, we can find the percentage of the total land that was cleared for planting:

\[ \text{Percentage cleared} = \left( \frac{C}{T} \right) \times 100 \]

\[ \text{Percentage cleared} = \left( \frac{6300}{6999.999999999999} \right) \times 100 \]

\[ \text{Percentage cleared} \approx \left( \frac{6300}{7000} \right) \times 100 \] (rounded T to 7000 for simplicity)

\[ \text{Percentage cleared} \approx 0.9 \times 100 \]

\[ \text{Percentage cleared} \approx 90\% \]

Therefore, approximately 90% of the land was cleared for planting.
농부가 소유한 총 토지를 \( T \), 식목을 위해 개간된 토지를 \( C \),라고 표시하겠습니다. 주어진 토지는 \( T = 6999.9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999