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(12y+9)+(15y-6)=180
We move all terms to the left:
(12y+9)+(15y-6)-(180)=0
We get rid of parentheses
12y+15y+9-6-180=0
We add all the numbers together, and all the variables
27y-177=0
We move all terms containing y to the left, all other terms to the right
27y=177
y=177/27
y=6+5/9
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