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w/9-12=21
We move all terms to the left:
w/9-12-(21)=0
We add all the numbers together, and all the variables
w/9-33=0
We multiply all the terms by the denominator
w-33*9=0
We add all the numbers together, and all the variables
w-297=0
We move all terms containing w to the left, all other terms to the right
w=297
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