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6w+9=-6w-9
We move all terms to the left:
6w+9-(-6w-9)=0
We get rid of parentheses
6w+6w+9+9=0
We add all the numbers together, and all the variables
12w+18=0
We move all terms containing w to the left, all other terms to the right
12w=-18
w=-18/12
w=-1+1/2
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