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-11+13w=9+12w
We move all terms to the left:
-11+13w-(9+12w)=0
We add all the numbers together, and all the variables
13w-(12w+9)-11=0
We get rid of parentheses
13w-12w-9-11=0
We add all the numbers together, and all the variables
w-20=0
We move all terms containing w to the left, all other terms to the right
w=20
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