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6w+9=-12+13w
We move all terms to the left:
6w+9-(-12+13w)=0
We add all the numbers together, and all the variables
6w-(13w-12)+9=0
We get rid of parentheses
6w-13w+12+9=0
We add all the numbers together, and all the variables
-7w+21=0
We move all terms containing w to the left, all other terms to the right
-7w=-21
w=-21/-7
w=+3
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