21=2m-5

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Solution for 21=2m-5 equation: 



21=2m-5

We move all terms to the left:

21-(2m-5)=0

We get rid of parentheses

-2m+5+21=0

We add all the numbers together, and all the variables

-2m+26=0

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

-2m=-26

m=-26/-2

m=+13

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