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2w-2w+4w+3w-4w=18
We move all terms to the left:
2w-2w+4w+3w-4w-(18)=0
We add all the numbers together, and all the variables
3w-18=0
We move all terms containing w to the left, all other terms to the right
3w=18
w=18/3
w=6
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