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D( x )
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x in (-oo:1/4) U (1/4:+oo)
(16*x-(2*x)-2)/(4*x-1) = 0
(16*x-2*x-2)/(4*x-1) = 0
(14*x-2)/(4*x-1) = 0
14*x-2 = 0 // + 2
14*x = 2 // : 14
x = 2/14
x = 1/7
x = 1/7
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