13=2m-8-5m

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Solution for 13=2m-8-5m equation: 



13=2m-8-5m

We move all terms to the left:

13-(2m-8-5m)=0

We add all the numbers together, and all the variables

-(-3m-8)+13=0

We get rid of parentheses

3m+8+13=0

We add all the numbers together, and all the variables

3m+21=0

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

3m=-21

m=-21/3

m=-7

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