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18=6y+3y
We move all terms to the left:
18-(6y+3y)=0
We add all the numbers together, and all the variables
-(+9y)+18=0
We get rid of parentheses
-9y+18=0
We move all terms containing y to the left, all other terms to the right
-9y=-18
y=-18/-9
y=+2
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