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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1-x)/x = 0.65 // - 0.65
(1-x)/x-0.65 = 0
(1-x)/x+(-0.65*x)/x = 0
1-x-0.65*x = 0
1-1.65*x = 0
(1-1.65*x)/x = 0
(1-1.65*x)/x = 0 // * x
1-1.65*x = 0
1-1.65*x = 0 // - 1
-1.65*x = -1 // : -1.65
x = -1/(-1.65)
x = 0.60606061
x = 0.60606061
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