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12=8+y/2
We move all terms to the left:
12-(8+y/2)=0
We add all the numbers together, and all the variables
-(y/2+8)+12=0
We get rid of parentheses
-y/2-8+12=0
We multiply all the terms by the denominator
-y-8*2+12*2=0
We add all the numbers together, and all the variables
-1y+8=0
We move all terms containing y to the left, all other terms to the right
-y=-8
y=-8/-1
y=+8
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