9-5m=m-21

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Solution for 9-5m=m-21 equation: 



9-5m=m-21

We move all terms to the left:

9-5m-(m-21)=0

We get rid of parentheses

-5m-m+21+9=0

We add all the numbers together, and all the variables

-6m+30=0

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

-6m=-30

m=-30/-6

m=+5

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