5m-9=8m+12

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Solution for 5m-9=8m+12 equation: 



5m-9=8m+12

We move all terms to the left:

5m-9-(8m+12)=0

We get rid of parentheses

5m-8m-12-9=0

We add all the numbers together, and all the variables

-3m-21=0

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

-3m=21

m=21/-3

m=-7

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