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13=w+8w=
We move all terms to the left:
13-(w+8w)=0
We add all the numbers together, and all the variables
-(+9w)+13=0
We get rid of parentheses
-9w+13=0
We move all terms containing w to the left, all other terms to the right
-9w=-13
w=-13/-9
w=1+4/9
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