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3=4w-21
We move all terms to the left:
3-(4w-21)=0
We get rid of parentheses
-4w+21+3=0
We add all the numbers together, and all the variables
-4w+24=0
We move all terms containing w to the left, all other terms to the right
-4w=-24
w=-24/-4
w=+6
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