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3w+9=w+31
We move all terms to the left:
3w+9-(w+31)=0
We get rid of parentheses
3w-w-31+9=0
We add all the numbers together, and all the variables
2w-22=0
We move all terms containing w to the left, all other terms to the right
2w=22
w=22/2
w=11
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