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18=12y-9y
We move all terms to the left:
18-(12y-9y)=0
We add all the numbers together, and all the variables
-(+3y)+18=0
We get rid of parentheses
-3y+18=0
We move all terms containing y to the left, all other terms to the right
-3y=-18
y=-18/-3
y=+6
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