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3y+15+2y+12.5=180
We move all terms to the left:
3y+15+2y+12.5-(180)=0
We add all the numbers together, and all the variables
5y-152.5=0
We move all terms containing y to the left, all other terms to the right
5y=152.5
y=152.5/5
y=30+2.5/5
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