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-(w+4)=-3w+9
We move all terms to the left:
-(w+4)-(-3w+9)=0
We get rid of parentheses
-w+3w-4-9=0
We add all the numbers together, and all the variables
2w-13=0
We move all terms containing w to the left, all other terms to the right
2w=13
w=13/2
w=6+1/2
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