9m-12=87

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Solution for 9m-12=87 equation: 



9m-12=87

We move all terms to the left:

9m-12-(87)=0

We add all the numbers together, and all the variables

9m-99=0

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

9m=99

m=99/9

m=11

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