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15=5(y-84)
We move all terms to the left:
15-(5(y-84))=0
We calculate terms in parentheses: -(5(y-84)), so:We get rid of parentheses
5(y-84)
We multiply parentheses
5y-420
Back to the equation:
-(5y-420)
-5y+420+15=0
We add all the numbers together, and all the variables
-5y+435=0
We move all terms containing y to the left, all other terms to the right
-5y=-435
y=-435/-5
y=+87
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