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8y+42=5y+81
We move all terms to the left:
8y+42-(5y+81)=0
We get rid of parentheses
8y-5y-81+42=0
We add all the numbers together, and all the variables
3y-39=0
We move all terms containing y to the left, all other terms to the right
3y=39
y=39/3
y=13
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