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2w+3(w-5)=15
We move all terms to the left:
2w+3(w-5)-(15)=0
We multiply parentheses
2w+3w-15-15=0
We add all the numbers together, and all the variables
5w-30=0
We move all terms containing w to the left, all other terms to the right
5w=30
w=30/5
w=6
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