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15=5y-75
We move all terms to the left:
15-(5y-75)=0
We get rid of parentheses
-5y+75+15=0
We add all the numbers together, and all the variables
-5y+90=0
We move all terms containing y to the left, all other terms to the right
-5y=-90
y=-90/-5
y=+18
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