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6w-4w=9+21
We move all terms to the left:
6w-4w-(9+21)=0
We add all the numbers together, and all the variables
6w-4w-30=0
We add all the numbers together, and all the variables
2w-30=0
We move all terms containing w to the left, all other terms to the right
2w=30
w=30/2
w=15
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