4−2+2−4= 4-2+2-4= 4−2+2−4=
Given that we are referring to addition and subtraction exercises, we solve the exercise from left to right:
4−2=2 4-2=2 4−2=2
2+2=4 2+2=4 2+2=4
4−4=0 4-4=0 4−4=0
0 0 0