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-3y+21=3(y-9)
We move all terms to the left:
-3y+21-(3(y-9))=0
We calculate terms in parentheses: -(3(y-9)), so:We get rid of parentheses
3(y-9)
We multiply parentheses
3y-27
Back to the equation:
-(3y-27)
-3y-3y+27+21=0
We add all the numbers together, and all the variables
-6y+48=0
We move all terms containing y to the left, all other terms to the right
-6y=-48
y=-48/-6
y=+8
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