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D( x )
(7*x^3)/3 <= 0
(7*x^3)/3 <= 0
(7*x^3)/3 <= 0
7/3*x^3 <= 0
7/3*x^3 <= 0 // : 7/3
x^3 <= 0/7/3
x^3 <= 0
x^3 <= 0 // ^ 1/3
x <= 0
x in (-oo:0>
x in (0:+oo)
ln((7*x^3)/3) = 10 // - 10
ln((7*x^3)/3)-10 = 0
ln((7*x^3)/3)-10 = 0 // + 10
ln((7*x^3)/3) = 10
ln((7*x^3)/3) = ln(e^10)
(7*x^3)/3 = e^10
(7*x^3)/3-e^10 = 0
7/3*x^3 = e^10 // : 7/3
x^3 = 3/7*e^10
x^3 = 3/7*e^10 // ^ 1/3
x = (3/7)^(1/3)*e^(10/3)
x = (3/7)^(1/3)*e^(10/3)
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