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12=3y-y=4y
We move all terms to the left:
12-(3y-y)=0
We add all the numbers together, and all the variables
-(+2y)+12=0
We get rid of parentheses
-2y+12=0
We move all terms containing y to the left, all other terms to the right
-2y=-12
y=-12/-2
y=+6
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