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