-2*m=-1

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Solution for -2*m=-1 equation: 



-2m=-1

We move all terms to the left:

-2m-(-1)=0

We add all the numbers together, and all the variables

-2m+1=0

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

-2m=-1

m=-1/-2

m=1/2

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