m+2m+m=12

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Solution for m+2m+m=12 equation: 



m+2m+m=12

We move all terms to the left:

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

We add all the numbers together, and all the variables

4m-12=0

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

4m=12

m=12/4

m=3

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