21=-m

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Solution for 21=-m equation: 



21=-m

We move all terms to the left:

21-(-m)=0

We add all the numbers together, and all the variables

-(-1m)+21=0

We get rid of parentheses

1m+21=0

We add all the numbers together, and all the variables

m+21=0

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

m=-21

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