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7w=w-40
We move all terms to the left:
7w-(w-40)=0
We get rid of parentheses
7w-w+40=0
We add all the numbers together, and all the variables
6w+40=0
We move all terms containing w to the left, all other terms to the right
6w=-40
w=-40/6
w=-6+2/3
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