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7y+13=8y+3
We move all terms to the left:
7y+13-(8y+3)=0
We get rid of parentheses
7y-8y-3+13=0
We add all the numbers together, and all the variables
-1y+10=0
We move all terms containing y to the left, all other terms to the right
-y=-10
y=-10/-1
y=+10
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