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9y-45=-9(y-7)
We move all terms to the left:
9y-45-(-9(y-7))=0
We calculate terms in parentheses: -(-9(y-7)), so:We get rid of parentheses
-9(y-7)
We multiply parentheses
-9y+63
Back to the equation:
-(-9y+63)
9y+9y-63-45=0
We add all the numbers together, and all the variables
18y-108=0
We move all terms containing y to the left, all other terms to the right
18y=108
y=108/18
y=6
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