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13-(-3w)=25
We move all terms to the left:
13-(-3w)-(25)=0
We add all the numbers together, and all the variables
-(-3w)-12=0
We get rid of parentheses
3w-12=0
We move all terms containing w to the left, all other terms to the right
3w=12
w=12/3
w=4
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