20=m-9

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Solution for 20=m-9 equation: 



20=m-9

We move all terms to the left:

20-(m-9)=0

We get rid of parentheses

-m+9+20=0

We add all the numbers together, and all the variables

-1m+29=0

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

-m=-29

m=-29/-1

m=+29

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