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13=w/20
We move all terms to the left:
13-(w/20)=0
We add all the numbers together, and all the variables
-(+w/20)+13=0
We get rid of parentheses
-w/20+13=0
We multiply all the terms by the denominator
-w+13*20=0
We add all the numbers together, and all the variables
-1w+260=0
We move all terms containing w to the left, all other terms to the right
-w=-260
w=-260/-1
w=+260
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