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