21+m=9m=11

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Solution for 21+m=9m=11 equation: 



21+m=9m=11

We move all terms to the left:

21+m-(9m)=0

We add all the numbers together, and all the variables

-8m+21=0

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

-8m=-21

m=-21/-8

m=2+5/8

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