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(5y-9)+(8y+42)=180
We move all terms to the left:
(5y-9)+(8y+42)-(180)=0
We get rid of parentheses
5y+8y-9+42-180=0
We add all the numbers together, and all the variables
13y-147=0
We move all terms containing y to the left, all other terms to the right
13y=147
y=147/13
y=11+4/13
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