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(12.5y+30)=80
We move all terms to the left:
(12.5y+30)-(80)=0
We get rid of parentheses
12.5y+30-80=0
We add all the numbers together, and all the variables
12.5y-50=0
We move all terms containing y to the left, all other terms to the right
12.5y=50
y=50/12.5
y=4
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