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90(y-30)=180
We move all terms to the left:
90(y-30)-(180)=0
We multiply parentheses
90y-2700-180=0
We add all the numbers together, and all the variables
90y-2880=0
We move all terms containing y to the left, all other terms to the right
90y=2880
y=2880/90
y=32
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