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2w-21=-3w+4
We move all terms to the left:
2w-21-(-3w+4)=0
We get rid of parentheses
2w+3w-4-21=0
We add all the numbers together, and all the variables
5w-25=0
We move all terms containing w to the left, all other terms to the right
5w=25
w=25/5
w=5
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