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31=8y-13
We move all terms to the left:
31-(8y-13)=0
We get rid of parentheses
-8y+13+31=0
We add all the numbers together, and all the variables
-8y+44=0
We move all terms containing y to the left, all other terms to the right
-8y=-44
y=-44/-8
y=5+1/2
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