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18=12+2w
We move all terms to the left:
18-(12+2w)=0
We add all the numbers together, and all the variables
-(2w+12)+18=0
We get rid of parentheses
-2w-12+18=0
We add all the numbers together, and all the variables
-2w+6=0
We move all terms containing w to the left, all other terms to the right
-2w=-6
w=-6/-2
w=+3
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