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4=13w-9w-8
We move all terms to the left:
4-(13w-9w-8)=0
We add all the numbers together, and all the variables
-(4w-8)+4=0
We get rid of parentheses
-4w+8+4=0
We add all the numbers together, and all the variables
-4w+12=0
We move all terms containing w to the left, all other terms to the right
-4w=-12
w=-12/-4
w=+3
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