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-7(y-9)=2y+9
We move all terms to the left:
-7(y-9)-(2y+9)=0
We multiply parentheses
-7y-(2y+9)+63=0
We get rid of parentheses
-7y-2y-9+63=0
We add all the numbers together, and all the variables
-9y+54=0
We move all terms containing y to the left, all other terms to the right
-9y=-54
y=-54/-9
y=+6
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