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x in (-oo:+oo)
((4/3)*x^3)/4 = 5*k // - 5*k
((4/3)*x^3)/4-(5*k) = 0
((4/3)*x^3)/4-5*k = 0
1/3*x^3 = -(-5*k) // : 1/3
x^3 = 15*k
x^3 = 15*k // ^ 1/3
x = 15^(1/3)*k^(1/3)
x = 15^(1/3)*k^(1/3)
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