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-13=w/4+4
We move all terms to the left:
-13-(w/4+4)=0
We get rid of parentheses
-w/4-4-13=0
We multiply all the terms by the denominator
-w-4*4-13*4=0
We add all the numbers together, and all the variables
-1w-68=0
We move all terms containing w to the left, all other terms to the right
-w=68
w=68/-1
w=-68
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