Find mistake I will give brainlist

Wally made a mistake on the first step when he wrote 2x - 3 = 18

Here’s the correct one:

2 (x-3) = 18 Given

2x-6=18 •Multiply x-3 by 2
2x=18+6 •6 chances the sign after
skipping the = sign
2x=24

Therefore:
X= 12 • divided both sides by 2
to get x