Question

Which error, if any, was made?

Answer 1

2x-8=12
First you add 8 to both sides...
2x = 20
Then you divide each side by 2...
x = 20
Done

Wrong things...
- did not do the same thing to the entire side of each side
- wrong multiplication choice

Answer 2

$2x-8=12\ \ \ \ |\cdot\dfrac{1}{2}\\\\\left(\dfrac{1}{2}\right)2x-\left(\dfrac{1}{2}\right)8=12\ \ \ |\text{here you have the mistake}\\\\\\\boxed{\text{The multiplication property of equality was not applied correctly.}}$