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-19=2w-9
We move all terms to the left:
-19-(2w-9)=0
We get rid of parentheses
-2w+9-19=0
We add all the numbers together, and all the variables
-2w-10=0
We move all terms containing w to the left, all other terms to the right
-2w=10
w=10/-2
w=-5
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