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D( x )
x < 0
x < 0
x in <0:+oo)
V = (4/3)*r^3*x^3.14 // - (4/3)*r^3*x^3.14
V-((4/3)*r^3*x^3.14) = 0
V+(-4/3)*r^3*x^3.14 = 0
-4/3*r^3*x^3.14 = -V // : -4/3*r^3
x^3.14 = 3/4*V*r^-3
x^3 = (3/4*V*r^-3)^(1/0.14) // ^ 1/3
x = (3/4)^2.3809523561904762*V^2.3809523561904762*r^-7.1428570685714286
x = (3/4)^2.3809523561904762*V^2.3809523561904762*r^-7.1428570685714286
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