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-80+3y=-7y
We move all terms to the left:
-80+3y-(-7y)=0
We get rid of parentheses
3y+7y-80=0
We add all the numbers together, and all the variables
10y-80=0
We move all terms containing y to the left, all other terms to the right
10y=80
y=80/10
y=8
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