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9=15+2w
We move all terms to the left:
9-(15+2w)=0
We add all the numbers together, and all the variables
-(2w+15)+9=0
We get rid of parentheses
-2w-15+9=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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