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-20=w/6-18
We move all terms to the left:
-20-(w/6-18)=0
We get rid of parentheses
-w/6+18-20=0
We multiply all the terms by the denominator
-w+18*6-20*6=0
We add all the numbers together, and all the variables
-1w-12=0
We move all terms containing w to the left, all other terms to the right
-w=12
w=12/-1
w=-12
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