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3(3w+4)=30
We move all terms to the left:
3(3w+4)-(30)=0
We multiply parentheses
9w+12-30=0
We add all the numbers together, and all the variables
9w-18=0
We move all terms containing w to the left, all other terms to the right
9w=18
w=18/9
w=2
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