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-13+9w=11+7w
We move all terms to the left:
-13+9w-(11+7w)=0
We add all the numbers together, and all the variables
9w-(7w+11)-13=0
We get rid of parentheses
9w-7w-11-13=0
We add all the numbers together, and all the variables
2w-24=0
We move all terms containing w to the left, all other terms to the right
2w=24
w=24/2
w=12
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