21=-5m-9

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Solution for 21=-5m-9 equation: 



21=-5m-9

We move all terms to the left:

21-(-5m-9)=0

We get rid of parentheses

5m+9+21=0

We add all the numbers together, and all the variables

5m+30=0

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

5m=-30

m=-30/5

m=-6

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