21=5+2m

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Solution for 21=5+2m equation: 



21=5+2m

We move all terms to the left:

21-(5+2m)=0

We add all the numbers together, and all the variables

-(2m+5)+21=0

We get rid of parentheses

-2m-5+21=0

We add all the numbers together, and all the variables

-2m+16=0

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

-2m=-16

m=-16/-2

m=+8

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