3=21-3w

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Solution for 3=21-3w equation: 



3=21-3w

We move all terms to the left:

3-(21-3w)=0

We add all the numbers together, and all the variables

-(-3w+21)+3=0

We get rid of parentheses

3w-21+3=0

We add all the numbers together, and all the variables

3w-18=0

We move all terms containing w to the left, all other terms to the right

3w=18

w=18/3

w=6

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