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3w-10=w+30
We move all terms to the left:
3w-10-(w+30)=0
We get rid of parentheses
3w-w-30-10=0
We add all the numbers together, and all the variables
2w-40=0
We move all terms containing w to the left, all other terms to the right
2w=40
w=40/2
w=20
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