20=0.4m

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Solution for 20=0.4m equation: 



20=0.4m

We move all terms to the left:

20-(0.4m)=0

We add all the numbers together, and all the variables

-(+0.4m)+20=0

We get rid of parentheses

-0.4m+20=0

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

-0.4m=-20

m=-20/-0.4

m=+50

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