-9=-2m-1

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



-9=-2m-1

We move all terms to the left:

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

We get rid of parentheses

2m+1-9=0

We add all the numbers together, and all the variables

2m-8=0

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

2m=8

m=8/2

m=4

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