Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: Let $ a$, $ b$, $ c$, $ x$, $ y$, and $ z$ be real numbers that satisfy the three equations
\begin{align*}
  13x +  by +  cz &= 0 \\
   ax + 23y +  cz &= 0 \\
   ax +  by + 42z &= 0.
\end{align*}Suppose that $ a \ne 13$ and $ x \ne 0$.  What is the value of
\[ \frac{a}{a - 13} + \frac{b}{b - 23} + \frac{c}{c - 42} \, ?\]
user