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5=7w+8w
We move all terms to the left:
5-(7w+8w)=0
We add all the numbers together, and all the variables
-(+15w)+5=0
We get rid of parentheses
-15w+5=0
We move all terms containing w to the left, all other terms to the right
-15w=-5
w=-5/-15
w=1/3
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