Factorizing a $6$th degree polynomial with $7$ terms.

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$$f(x) = 5x^6 + 6x^5 - 48x^4 - 68x^3 + 58x^2 + 128x + 15$$

How to simplify this to $(x^3 - 8x - 1) (5x^3 + 6x^2 - 8x - 15)$?

I have no idea. Thank you.