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9=2w-13
We move all terms to the left:
9-(2w-13)=0
We get rid of parentheses
-2w+13+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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