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X in (-oo:+oo)
4-((4*X^3)/6)+28 = 0
(-2/3)*X^3+4+28 = 0
-2/3*X^3 = -32 // : -2/3
X^3 = 48
X^3 = 48 // ^ 1/3
X = 2*6^(1/3)
X = 2*6^(1/3)
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