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