9m-3m-4m=20

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Solution for 9m-3m-4m=20 equation: 



9m-3m-4m=20

We move all terms to the left:

9m-3m-4m-(20)=0

We add all the numbers together, and all the variables

2m-20=0

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

2m=20

m=20/2

m=10

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