### Instruction: I take variable $b$, double it, and add four.  I subtract $4b$ from this new expression, and divide the resulting difference by two.  What is my final expression in simplest form?### Response: So first, let's double $b$. That's $2b$.
And then we add four, so that's $2b+4$.
Now we subtract $4b$ from that. So that's $2b+4-4b$.
Which simplifies to $-2b+4$.
Finally, we divide that by two, so our final expression is $\frac{-2b+4}{2}$.
And that simplifies to $-b+2$.