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7w=15-2w
We move all terms to the left:
7w-(15-2w)=0
We add all the numbers together, and all the variables
7w-(-2w+15)=0
We get rid of parentheses
7w+2w-15=0
We add all the numbers together, and all the variables
9w-15=0
We move all terms containing w to the left, all other terms to the right
9w=15
w=15/9
w=1+2/3
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