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9y=12y-12
We move all terms to the left:
9y-(12y-12)=0
We get rid of parentheses
9y-12y+12=0
We add all the numbers together, and all the variables
-3y+12=0
We move all terms containing y to the left, all other terms to the right
-3y=-12
y=-12/-3
y=+4
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