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13=4+w/3
We move all terms to the left:
13-(4+w/3)=0
We add all the numbers together, and all the variables
-(w/3+4)+13=0
We get rid of parentheses
-w/3-4+13=0
We multiply all the terms by the denominator
-w-4*3+13*3=0
We add all the numbers together, and all the variables
-1w+27=0
We move all terms containing w to the left, all other terms to the right
-w=-27
w=-27/-1
w=+27
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