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11w-5w+2w+2w-5w=15
We move all terms to the left:
11w-5w+2w+2w-5w-(15)=0
We add all the numbers together, and all the variables
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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