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X in (-oo:+oo)
(1/25)*X^3-((9/4)*X) = 0
(1/25)*X^3+(-9/4)*X = 0
1/25*X^3-9/4*X = 0
X*(1/25*X^2-9/4) = 0
1/25*X^2 = 9/4 // : 1/25
X^2 = 225/4
X^2 = 225/4 // ^ 1/2
abs(X) = 15/2
X = 15/2 or X = -15/2
X = 0
X = 0
X in { 15/2, -15/2, 0 }
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