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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)
2.5 = x/(1-x) // - x/(1-x)
2.5-(x/(1-x)) = 0
(-1*x)/(1-x)+2.5 = 0
(-1*x)/(1-x)+(2.5*(1-x))/(1-x) = 0
2.5*(1-x)-1*x = 0
2.5-3.5*x = 0
(2.5-3.5*x)/(1-x) = 0
(2.5-3.5*x)/(1-x) = 0 // * 1-x
2.5-3.5*x = 0
2.5-3.5*x = 0 // - 2.5
-3.5*x = -2.5 // : -3.5
x = -2.5/(-3.5)
x = 0.71428571
x = 0.71428571
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