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D( x )
2*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
(4*x-1)/(2*x) = 1.5 // - 1.5
(4*x-1)/(2*x)-1.5 = 0
(4*x-1)/(2*x)+(-1.5*2*x)/(2*x) = 0
4*x-1.5*2*x-1 = 0
x-1 = 0
(x-1)/(2*x) = 0
(x-1)/(2*x) = 0 // * 2*x
x-1 = 0
x-1 = 0 // + 1
x = 1
x = 1
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