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D( x )
x < 0
x < 0
x in <0:+oo)
v = (4/3)*x^3.14*x^8 // - (4/3)*x^3.14*x^8
v-((4/3)*x^3.14*x^8) = 0
v+(-4/3)*x^11.14 = 0
-4/3*x^11.14 = -v // : -4/3
x^11.14 = 3/4*v
x^11 = (3/4*v)^(1/0.14) // ^ 1/11
x = (3/4)^0.6493506425974026*v^0.6493506425974026
x = (3/4)^0.6493506425974026*v^0.6493506425974026
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