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31=2y+10
We move all terms to the left:
31-(2y+10)=0
We get rid of parentheses
-2y-10+31=0
We add all the numbers together, and all the variables
-2y+21=0
We move all terms containing y to the left, all other terms to the right
-2y=-21
y=-21/-2
y=10+1/2
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