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D( x )
(3*x)^4 = 0
(3*x)^4 = 0
(3*x)^4 = 0
81*x^4 = 0 // : 81
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
x*((4*x-1)/((3*x)^4)) = 0
(x*(4*x-1))/(81*x^4) = 0
( 4*x-1 )
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
( x )
x = 0
x in { 0}
x = 1/4
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