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(8y-40)+(5y+20)=180
We move all terms to the left:
(8y-40)+(5y+20)-(180)=0
We get rid of parentheses
8y+5y-40+20-180=0
We add all the numbers together, and all the variables
13y-200=0
We move all terms containing y to the left, all other terms to the right
13y=200
y=200/13
y=15+5/13
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