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-7=w/2-13
We move all terms to the left:
-7-(w/2-13)=0
We get rid of parentheses
-w/2+13-7=0
We multiply all the terms by the denominator
-w+13*2-7*2=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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