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A comment on Twice as happy customers means half the marketing spend. Parent comment

Re:Twice as happy customers means half the marketing spend by Sean1708 on Friday June 23, 2017 @08:54AM (#14618774)
It's not a textbook but Khan Academy's Linear Algebra[0] course is a good start.

[0]: https://www.khanacademy.org/math/linear-algebra

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