4 - look thought the following work, find the mistake, and circle it. then, to the side, show the appropriate work.

There is 1 mistake:
This person distributed and came out with the wrong answer.
It is not:
[tex]-2(x -3) = 20\\\\-2x - 6 = 20[/tex]
This is the corrected form:
[tex]-2(x - 3) = 20\\\\-2x + 6 = 20[/tex]