21=-10m-9

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Solution for 21=-10m-9 equation: 



21=-10m-9

We move all terms to the left:

21-(-10m-9)=0

We get rid of parentheses

10m+9+21=0

We add all the numbers together, and all the variables

10m+30=0

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

10m=-30

m=-30/10

m=-3

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