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21w=14w-3w+100
We move all terms to the left:
21w-(14w-3w+100)=0
We add all the numbers together, and all the variables
21w-(11w+100)=0
We get rid of parentheses
21w-11w-100=0
We add all the numbers together, and all the variables
10w-100=0
We move all terms containing w to the left, all other terms to the right
10w=100
w=100/10
w=10
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