-9m-12m=-21m

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Solution for -9m-12m=-21m equation: 



-9m-12m=-21m

We move all terms to the left:

-9m-12m-(-21m)=0

We add all the numbers together, and all the variables

-21m-(-21m)=0

We get rid of parentheses

-21m+21m=0

We add all the numbers together, and all the variables

=0

m=0/1

m=0

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