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D( x )
1-x = 0
1-x = 0
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x in (-oo:1) U (1:+oo)
1.29/(1-x) = 0.83 // - 0.83
1.29/(1-x)-0.83 = 0
1.29/(1-x)+(-0.83*(1-x))/(1-x) = 0
1.29-0.83*(1-x) = 0
0.83*x+0.46 = 0
(0.83*x+0.46)/(1-x) = 0
(0.83*x+0.46)/(1-x) = 0 // * 1-x
0.83*x+0.46 = 0
0.83*x+0.46 = 0 // - 0.46
0.83*x = -0.46 // : 0.83
x = -0.46/0.83
x = -0.55421687
x = -0.55421687
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