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4=w/2+13
We move all terms to the left:
4-(w/2+13)=0
We get rid of parentheses
-w/2-13+4=0
We multiply all the terms by the denominator
-w-13*2+4*2=0
We add all the numbers together, and all the variables
-1w-18=0
We move all terms containing w to the left, all other terms to the right
-w=18
w=18/-1
w=-18
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