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7=w/9+4
We move all terms to the left:
7-(w/9+4)=0
We get rid of parentheses
-w/9-4+7=0
We multiply all the terms by the denominator
-w-4*9+7*9=0
We add all the numbers together, and all the variables
-1w+27=0
We move all terms containing w to the left, all other terms to the right
-w=-27
w=-27/-1
w=+27
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