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w/2+9=13
We move all terms to the left:
w/2+9-(13)=0
We add all the numbers together, and all the variables
w/2-4=0
We multiply all the terms by the denominator
w-4*2=0
We add all the numbers together, and all the variables
w-8=0
We move all terms containing w to the left, all other terms to the right
w=8
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