21=3m-621

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Solution for 21=3m-621 equation: 



21=3m-621

We move all terms to the left:

21-(3m-621)=0

We get rid of parentheses

-3m+621+21=0

We add all the numbers together, and all the variables

-3m+642=0

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

-3m=-642

m=-642/-3

m=+214

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