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30=-6w+12w
We move all terms to the left:
30-(-6w+12w)=0
We add all the numbers together, and all the variables
-(+6w)+30=0
We get rid of parentheses
-6w+30=0
We move all terms containing w to the left, all other terms to the right
-6w=-30
w=-30/-6
w=+5
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