-21=-3-m

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Solution for -21=-3-m equation: 



-21=-3-m

We move all terms to the left:

-21-(-3-m)=0

We add all the numbers together, and all the variables

-(-1m-3)-21=0

We get rid of parentheses

1m+3-21=0

We add all the numbers together, and all the variables

m-18=0

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

m=18

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