21=2m+8

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Solution for 21=2m+8 equation: 



21=2m+8

We move all terms to the left:

21-(2m+8)=0

We get rid of parentheses

-2m-8+21=0

We add all the numbers together, and all the variables

-2m+13=0

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

-2m=-13

m=-13/-2

m=6+1/2

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