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20=w/13+18
We move all terms to the left:
20-(w/13+18)=0
We get rid of parentheses
-w/13-18+20=0
We multiply all the terms by the denominator
-w-18*13+20*13=0
We add all the numbers together, and all the variables
-1w+26=0
We move all terms containing w to the left, all other terms to the right
-w=-26
w=-26/-1
w=+26
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