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31=2y-9
We move all terms to the left:
31-(2y-9)=0
We get rid of parentheses
-2y+9+31=0
We add all the numbers together, and all the variables
-2y+40=0
We move all terms containing y to the left, all other terms to the right
-2y=-40
y=-40/-2
y=+20
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