21=-3+m

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Solution for 21=-3+m equation: 



21=-3+m

We move all terms to the left:

21-(-3+m)=0

We add all the numbers together, and all the variables

-(m-3)+21=0

We get rid of parentheses

-m+3+21=0

We add all the numbers together, and all the variables

-1m+24=0

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

-m=-24

m=-24/-1

m=+24

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