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D( x )
-3*v^2*x^5 = 0
-3*v^2*x^5 = 0
-3*v^2*x^5 = 0
-3*v^2*x^5 = 0 // : -3*v^2
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(24*v^3*x^3-(19*v^3*x^6))/(-3*v^2*x^5) = 0
(24*v^3*x^3-19*v^3*x^6)/(-3*v^2*x^5) = 0
24*v^3*x^3-19*v^3*x^6 = 0
v^3*x^3*(24-19*x^3) = 0
-19*x^3 = -24 // : -19
x^3 = 24/19
x^3 = 24/19 // ^ 1/3
x = (24/19)^(1/3)
v^3*x^3*(x-(24/19)^(1/3)) = 0
(v^3*x^3*(x-(24/19)^(1/3)))/(-3*v^2*x^5) = 0
( v^3*x^3 )
v^3*x^3 = 0 // : v^3
x^3 = 0
x = 0
( x-(24/19)^(1/3) )
x-(24/19)^(1/3) = 0 // + (24/19)^(1/3)
x = (24/19)^(1/3)
x in { 0}
x = (24/19)^(1/3)
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