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18=4.5y
We move all terms to the left:
18-(4.5y)=0
We add all the numbers together, and all the variables
-(+4.5y)+18=0
We get rid of parentheses
-4.5y+18=0
We move all terms containing y to the left, all other terms to the right
-4.5y=-18
y=-18/-4.5
y=+4
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