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12w+19=-20+9w
We move all terms to the left:
12w+19-(-20+9w)=0
We add all the numbers together, and all the variables
12w-(9w-20)+19=0
We get rid of parentheses
12w-9w+20+19=0
We add all the numbers together, and all the variables
3w+39=0
We move all terms containing w to the left, all other terms to the right
3w=-39
w=-39/3
w=-13
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