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