3m-9=2m+12

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Solution for 3m-9=2m+12 equation: 



3m-9=2m+12

We move all terms to the left:

3m-9-(2m+12)=0

We get rid of parentheses

3m-2m-12-9=0

We add all the numbers together, and all the variables

m-21=0

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

m=21

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