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x in (-oo:+oo)
-2 = (2*x^3)/5 // - (2*x^3)/5
-((2*x^3)/5)-2 = 0
(-2/5)*x^3-2 = 0
-2/5*x^3 = 2 // : -2/5
x^3 = -5
x^3 = -5 // ^ 1/3
x = -5^(1/3)
x = -5^(1/3)
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