0=m-21

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Solution for 0=m-21 equation: 



0=m-21

We move all terms to the left:

0-(m-21)=0

We add all the numbers together, and all the variables

-(m-21)=0

We get rid of parentheses

-m+21=0

We add all the numbers together, and all the variables

-1m+21=0

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

-m=-21

m=-21/-1

m=+21

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