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X in (-oo:+oo)
5*X^3-((40/4)*X^3)-32 = 0
5*X^3-10*X^3-32 = 0
-5*X^3 = 32 // : -5
X^3 = -32/5
X^3 = -32/5 // ^ 1/3
X = -(32/5)^(1/3)
X = -(32/5)^(1/3)
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