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20=y-2+31
We move all terms to the left:
20-(y-2+31)=0
We add all the numbers together, and all the variables
-(y+29)+20=0
We get rid of parentheses
-y-29+20=0
We add all the numbers together, and all the variables
-1y-9=0
We move all terms containing y to the left, all other terms to the right
-y=9
y=9/-1
y=-9
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