3m+m-7+3m=21

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Solution for 3m+m-7+3m=21 equation: 



3m+m-7+3m=21

We move all terms to the left:

3m+m-7+3m-(21)=0

We add all the numbers together, and all the variables

7m-28=0

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

7m=28

m=28/7

m=4

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