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31+y-13=9y-10-4y
We move all terms to the left:
31+y-13-(9y-10-4y)=0
We add all the numbers together, and all the variables
y-(5y-10)+31-13=0
We add all the numbers together, and all the variables
y-(5y-10)+18=0
We get rid of parentheses
y-5y+10+18=0
We add all the numbers together, and all the variables
-4y+28=0
We move all terms containing y to the left, all other terms to the right
-4y=-28
y=-28/-4
y=+7
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