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2w+-21=9w+14
We move all terms to the left:
2w+-21-(9w+14)=0
We add all the numbers together, and all the variables
2w-(9w+14)=0
We get rid of parentheses
2w-9w-14=0
We add all the numbers together, and all the variables
-7w-14=0
We move all terms containing w to the left, all other terms to the right
-7w=14
w=14/-7
w=-2
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