7m-9=12

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Solution for 7m-9=12 equation: 



7m-9=12

We move all terms to the left:

7m-9-(12)=0

We add all the numbers together, and all the variables

7m-21=0

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

7m=21

m=21/7

m=3

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