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(4y-15)+(y+20)=180
We move all terms to the left:
(4y-15)+(y+20)-(180)=0
We get rid of parentheses
4y+y-15+20-180=0
We add all the numbers together, and all the variables
5y-175=0
We move all terms containing y to the left, all other terms to the right
5y=175
y=175/5
y=35
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