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D( x )
x < 0
x < 0
x in <0:+oo)
v = (1/3)*x^1*x^3*x^3.14 // - (1/3)*x^1*x^3*x^3.14
v-((1/3)*x^1*x^3*x^3.14) = 0
v+(-1/3)*x^7.14 = 0
-1/3*x^7.14 = -v // : -1/3
x^7.14 = 3*v
x^7 = (3*v)^(1/0.14) // ^ 1/7
x = 3^1.0204081424489796*v^1.0204081424489796
x = 3^1.0204081424489796*v^1.0204081424489796
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