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86=2y-42.
We move all terms to the left:
86-(2y-42.)=0
We add all the numbers together, and all the variables
-(2y-42)+86=0
We get rid of parentheses
-2y+42+86=0
We add all the numbers together, and all the variables
-2y+128=0
We move all terms containing y to the left, all other terms to the right
-2y=-128
y=-128/-2
y=+64
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