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w/2-7=13
We move all terms to the left:
w/2-7-(13)=0
We add all the numbers together, and all the variables
w/2-20=0
We multiply all the terms by the denominator
w-20*2=0
We add all the numbers together, and all the variables
w-40=0
We move all terms containing w to the left, all other terms to the right
w=40
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