7m+8-9m=20

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Solution for 7m+8-9m=20 equation: 



7m+8-9m=20

We move all terms to the left:

7m+8-9m-(20)=0

We add all the numbers together, and all the variables

-2m-12=0

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

-2m=12

m=12/-2

m=-6

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