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(20y-5)+(5y-15)=180
We move all terms to the left:
(20y-5)+(5y-15)-(180)=0
We get rid of parentheses
20y+5y-5-15-180=0
We add all the numbers together, and all the variables
25y-200=0
We move all terms containing y to the left, all other terms to the right
25y=200
y=200/25
y=8
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