9m-1-2m+8=84

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Solution for 9m-1-2m+8=84 equation: 



9m-1-2m+8=84

We move all terms to the left:

9m-1-2m+8-(84)=0

We add all the numbers together, and all the variables

7m-77=0

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

7m=77

m=77/7

m=11

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