21=2m-13

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Solution for 21=2m-13 equation: 



21=2m-13

We move all terms to the left:

21-(2m-13)=0

We get rid of parentheses

-2m+13+21=0

We add all the numbers together, and all the variables

-2m+34=0

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

-2m=-34

m=-34/-2

m=+17

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