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