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