-m-9=-2m-1

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Solution for -m-9=-2m-1 equation: 



-m-9=-2m-1

We move all terms to the left:

-m-9-(-2m-1)=0

We add all the numbers together, and all the variables

-1m-(-2m-1)-9=0

We get rid of parentheses

-1m+2m+1-9=0

We add all the numbers together, and all the variables

m-8=0

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

m=8

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