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-20=-4y-12
We move all terms to the left:
-20-(-4y-12)=0
We get rid of parentheses
4y+12-20=0
We add all the numbers together, and all the variables
4y-8=0
We move all terms containing y to the left, all other terms to the right
4y=8
y=8/4
y=2
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