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20=2y+12
We move all terms to the left:
20-(2y+12)=0
We get rid of parentheses
-2y-12+20=0
We add all the numbers together, and all the variables
-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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