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w/3+1+4=12
We move all terms to the left:
w/3+1+4-(12)=0
We add all the numbers together, and all the variables
w/3-7=0
We multiply all the terms by the denominator
w-7*3=0
We add all the numbers together, and all the variables
w-21=0
We move all terms containing w to the left, all other terms to the right
w=21
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