How do you transform vector expression (*) into [M,A] – 3[M,B] = 7[M,C] using Maple command?

  Thank you for your help !

How can I display an array in a Mathcontainer Component ?

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How do I download and save "MaplePrimes" ?

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I myself have written some programs of math in Maple (e.g. ABC.lib, ABC.ind, ABC.mw).
Who could help me how to upload these programs for everyone using easily without downloading and setup them? Thank you so much!

How could I have information of serial of a hard disk in Maple? Thank you very much!