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-9(y-8)=-3y+42
We move all terms to the left:
-9(y-8)-(-3y+42)=0
We multiply parentheses
-9y-(-3y+42)+72=0
We get rid of parentheses
-9y+3y-42+72=0
We add all the numbers together, and all the variables
-6y+30=0
We move all terms containing y to the left, all other terms to the right
-6y=-30
y=-30/-6
y=+5
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