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D( x )
4*x^5 = 0
4*x^5 = 0
4*x^5 = 0
4*x^5 = 0 // : 4
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(20*u^3*x^3-(16*v^5*x^4))/(4*x^5) = 0
(20*u^3*x^3-16*v^5*x^4)/(4*x^5) = 0
20*u^3*x^3-16*v^5*x^4 = 0
4*x^3*(5*u^3-4*v^5*x) = 0
5*u^3-4*v^5*x = 0 // - 5*u^3
-4*v^5*x = -(5*u^3) // : -4*v^5
x = (-(5*u^3))/(-4*v^5)
x = (-5*u^3)/(-4*v^5)
4*x^3*(x-5/4*u^3*v^-5) = 0
(4*x^3*(x-5/4*u^3*v^-5))/(4*x^5) = 0
( 4*x^3 )
4*x^3 = 0 // : 4
x^3 = 0
x = 0
( x-5/4*u^3*v^-5 )
x-5/4*u^3*v^-5 = 0 // + -5/4*u^3*v^-5
x = -(-5/4*u^3*v^-5)
x = 5/4*u^3*v^-5
x in { 0}
x = 5/4*u^3*v^-5
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