1-2m-5m=-20

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Solution for 1-2m-5m=-20 equation: 



1-2m-5m=-20

We move all terms to the left:

1-2m-5m-(-20)=0

We add all the numbers together, and all the variables

-7m+21=0

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

-7m=-21

m=-21/-7

m=+3

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