21=3w-12

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Solution for 21=3w-12 equation: 



21=3w-12

We move all terms to the left:

21-(3w-12)=0

We get rid of parentheses

-3w+12+21=0

We add all the numbers together, and all the variables

-3w+33=0

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

-3w=-33

w=-33/-3

w=+11

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