21=m+13

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Solution for 21=m+13 equation: 



21=m+13

We move all terms to the left:

21-(m+13)=0

We get rid of parentheses

-m-13+21=0

We add all the numbers together, and all the variables

-1m+8=0

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

-m=-8

m=-8/-1

m=+8

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