9m-11m-(-3m)+(-9)=-20

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Solution for 9m-11m-(-3m)+(-9)=-20 equation: 



9m-11m-(-3m)+(-9)=-20

We move all terms to the left:

9m-11m-(-3m)+(-9)-(-20)=0

We add all the numbers together, and all the variables

-2m-(-3m)+11=0

We get rid of parentheses

-2m+3m+11=0

We add all the numbers together, and all the variables

m+11=0

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

m=-11

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