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13=w-3+4
We move all terms to the left:
13-(w-3+4)=0
We add all the numbers together, and all the variables
-(w+1)+13=0
We get rid of parentheses
-w-1+13=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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