21=0.75m

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Solution for 21=0.75m equation: 



21=0.75m

We move all terms to the left:

21-(0.75m)=0

We add all the numbers together, and all the variables

-(+0.75m)+21=0

We get rid of parentheses

-0.75m+21=0

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

-0.75m=-21

m=-21/-0.75

m=+28

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