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D( x )
125*x-20 = 0
125*x-20 = 0
125*x-20 = 0
125*x-20 = 0 // + 20
125*x = 20 // : 125
x = 20/125
x = 4/25
x in (-oo:4/25) U (4/25:+oo)
(125*x-30)/(125*x-20) = 0.857 // - 0.857
(125*x-30)/(125*x-20)-0.857 = 0
(125*x-30)/(125*x-20)+(-0.857*(125*x-20))/(125*x-20) = 0
125*x-0.857*(125*x-20)-30 = 0
17.875*x-12.86 = 0
(17.875*x-12.86)/(125*x-20) = 0
(17.875*x-12.86)/(125*x-20) = 0 // * 125*x-20
17.875*x-12.86 = 0
17.875*x-12.86 = 0 // + 12.86
17.875*x = 12.86 // : 17.875
x = 12.86/17.875
x = 0.71944056
x = 0.71944056
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