20-5m=2m-1

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



20-5m=2m-1

We move all terms to the left:

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

We get rid of parentheses

-5m-2m+1+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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