Answer:
Step 2
Step-by-step explanation:
In step 2 the expression was 40+20 which would have been 60 but he might have thought addition sign was subtraction so he did 40-20 which is 20 so he is wrong made mistake in step 2
D
I believe that the answer is C.
=)
4 is answer
y=2 x=6-2 x=4
