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x in (-oo:+oo)
5/2-((3/5)*x^3) = 0
(-3/5)*x^3+5/2 = 0
-3/5*x^3 = -5/2 // : -3/5
x^3 = 25/6
x^3 = 25/6 // ^ 1/3
x = (25/6)^(1/3)
x = (25/6)^(1/3)
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