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2+w/2=12
We move all terms to the left:
2+w/2-(12)=0
We add all the numbers together, and all the variables
w/2-10=0
We multiply all the terms by the denominator
w-10*2=0
We add all the numbers together, and all the variables
w-20=0
We move all terms containing w to the left, all other terms to the right
w=20
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