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D( x )
x < 0
x < 0
x in <0:+oo)
V = (4/3)*x^3.14*x^27 // - (4/3)*x^3.14*x^27
V-((4/3)*x^3.14*x^27) = 0
V+(-4/3)*x^30.14 = 0
-4/3*x^30.14 = -V // : -4/3
x^30.14 = 3/4*V
x^30 = (3/4*V)^(1/0.14) // ^ 1/30
abs(x) = (3/4)^0.2380952141904762*V^0.2380952141904762
x = (3/4)^0.2380952141904762*V^0.2380952141904762 or x = -((3/4)^0.2380952141904762*V^0.2380952141904762)
x in { (3/4)^0.2380952141904762*V^0.2380952141904762, -((3/4)^0.2380952141904762*V^0.2380952141904762) }
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