5m-m-m+3m=21

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Solution for 5m-m-m+3m=21 equation: 



5m-m-m+3m=21

We move all terms to the left:

5m-m-m+3m-(21)=0

We add all the numbers together, and all the variables

6m-21=0

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

6m=21

m=21/6

m=3+1/2

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