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-3-4w=-7w
We move all terms to the left:
-3-4w-(-7w)=0
We get rid of parentheses
-4w+7w-3=0
We add all the numbers together, and all the variables
3w-3=0
We move all terms containing w to the left, all other terms to the right
3w=3
w=3/3
w=1
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