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5y=7y-31
We move all terms to the left:
5y-(7y-31)=0
We get rid of parentheses
5y-7y+31=0
We add all the numbers together, and all the variables
-2y+31=0
We move all terms containing y to the left, all other terms to the right
-2y=-31
y=-31/-2
y=15+1/2
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