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D( x )
(2*x-2)^4 = 0
(2*x-2)^4 = 0
(2*x-2)^4 = 0
2*x-2 = 0 // + 2
2*x = 2 // : 2
x = 2/2
x = 1
x in (-oo:1) U (1:+oo)
(16*x-6)/((2*x-2)^4) = 0
16*x-6 = 0 // + 6
16*x = 6 // : 16
x = 6/16
x = 3/8
x = 3/8
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