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2w-6=7w-21
We move all terms to the left:
2w-6-(7w-21)=0
We get rid of parentheses
2w-7w+21-6=0
We add all the numbers together, and all the variables
-5w+15=0
We move all terms containing w to the left, all other terms to the right
-5w=-15
w=-15/-5
w=+3
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