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