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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)
13.65 = x/(1-x) // - x/(1-x)
13.65-(x/(1-x)) = 0
(-1*x)/(1-x)+13.65 = 0
(-1*x)/(1-x)+(13.65*(1-x))/(1-x) = 0
13.65*(1-x)-1*x = 0
13.65-14.65*x = 0
(13.65-14.65*x)/(1-x) = 0
(13.65-14.65*x)/(1-x) = 0 // * 1-x
13.65-14.65*x = 0
13.65-14.65*x = 0 // - 13.65
-14.65*x = -13.65 // : -14.65
x = -13.65/(-14.65)
x = 0.93174061
x = 0.93174061
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