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8=3y-y
We move all terms to the left:
8-(3y-y)=0
We add all the numbers together, and all the variables
-(+2y)+8=0
We get rid of parentheses
-2y+8=0
We move all terms containing y to the left, all other terms to the right
-2y=-8
y=-8/-2
y=+4
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