2m-9=-1

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Solution for 2m-9=-1 equation: 



2m-9=-1

We move all terms to the left:

2m-9-(-1)=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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