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81=6y+3
We move all terms to the left:
81-(6y+3)=0
We get rid of parentheses
-6y-3+81=0
We add all the numbers together, and all the variables
-6y+78=0
We move all terms containing y to the left, all other terms to the right
-6y=-78
y=-78/-6
y=+13
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