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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)
100/(1-x) = 127.92 // - 127.92
100/(1-x)-127.92 = 0
100/(1-x)+(-127.92*(1-x))/(1-x) = 0
100-127.92*(1-x) = 0
127.92*x-27.92 = 0
(127.92*x-27.92)/(1-x) = 0
(127.92*x-27.92)/(1-x) = 0 // * 1-x
127.92*x-27.92 = 0
127.92*x-27.92 = 0 // + 27.92
127.92*x = 27.92 // : 127.92
x = 27.92/127.92
x = 0.21826141
x = 0.21826141
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