-1-2m=7

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Solution for -1-2m=7 equation: 



-1-2m=7

We move all terms to the left:

-1-2m-(7)=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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