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(8y+3)+(4y+5)=80
We move all terms to the left:
(8y+3)+(4y+5)-(80)=0
We get rid of parentheses
8y+4y+3+5-80=0
We add all the numbers together, and all the variables
12y-72=0
We move all terms containing y to the left, all other terms to the right
12y=72
y=72/12
y=6
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