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12-4=y+y
We move all terms to the left:
12-4-(y+y)=0
We add all the numbers together, and all the variables
-(+2y)+12-4=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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