7m+12-9m=40

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Solution for 7m+12-9m=40 equation: 



7m+12-9m=40

We move all terms to the left:

7m+12-9m-(40)=0

We add all the numbers together, and all the variables

-2m-28=0

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

-2m=28

m=28/-2

m=-14

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