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-3(y+7)=-9y+21
We move all terms to the left:
-3(y+7)-(-9y+21)=0
We multiply parentheses
-3y-(-9y+21)-21=0
We get rid of parentheses
-3y+9y-21-21=0
We add all the numbers together, and all the variables
6y-42=0
We move all terms containing y to the left, all other terms to the right
6y=42
y=42/6
y=7
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