A Step 1
B Step 2
C Step 3
![A Step 1B Step 2 C Step 3 class=](https://us-static.z-dn.net/files/d3e/6a338bebd3651e25faae1e2a73b4c1cf.jpg)
Peyton's mistake was in Step 3, so the correct answer is C.
They added an extra negative sign when it wasn't needed.
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