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4=4y-12
We move all terms to the left:
4-(4y-12)=0
We get rid of parentheses
-4y+12+4=0
We add all the numbers together, and all the variables
-4y+16=0
We move all terms containing y to the left, all other terms to the right
-4y=-16
y=-16/-4
y=+4
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