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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)
y = (x-5)/(1-x) // - (x-5)/(1-x)
y-((x-5)/(1-x)) = 0
(-1*(x-5))/(1-x)+y = 0
(-1*(x-5))/(1-x)+(y*(1-x))/(1-x) = 0
y*(1-x)-1*(x-5) = 0
y-x-(x*y)+5 = 0
(y-x-(x*y)+5)/(1-x) = 0
(y-x-(x*y)+5)/(1-x) = 0 // * 1-x
y-x-(x*y)+5 = 0
x*(-y)+y+5 = 0 // - y+5
x*(-y) = -(y+5) // : -y
x = (-(y+5))/(-y)
x = (y+5)/y
x = (y+5)/y
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