-3m-2m=-20

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Solution for -3m-2m=-20 equation: 



-3m-2m=-20

We move all terms to the left:

-3m-2m-(-20)=0

We add all the numbers together, and all the variables

-5m+20=0

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

-5m=-20

m=-20/-5

m=+4

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