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