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2(w+8)+3w=21
We move all terms to the left:
2(w+8)+3w-(21)=0
We add all the numbers together, and all the variables
3w+2(w+8)-21=0
We multiply parentheses
3w+2w+16-21=0
We add all the numbers together, and all the variables
5w-5=0
We move all terms containing w to the left, all other terms to the right
5w=5
w=5/5
w=1
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