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7w-3-9w=-3w-10
We move all terms to the left:
7w-3-9w-(-3w-10)=0
We add all the numbers together, and all the variables
-2w-(-3w-10)-3=0
We get rid of parentheses
-2w+3w+10-3=0
We add all the numbers together, and all the variables
w+7=0
We move all terms containing w to the left, all other terms to the right
w=-7
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