numero 338
x^3 + x^2 - 25·x - 25 > 0
(x^3 + x^2) - (25·x + 25) > 0
x^2·(x + 1) - 25·(x + 1) > 0
(x + 1)·(x^2 - 25) > 0
(x + 1)·(x + 5)·(x - 5) > 0
-5 < x < -1 ∨ x > 5
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