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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)
1 = 0.91/(1-x) // - 0.91/(1-x)
1-(0.91/(1-x)) = 0
1-0.91*(1-x)^-1 = 0
1-0.91/(1-x) = 0
(1*(1-x))/(1-x)-0.91/(1-x) = 0
1*(1-x)-0.91 = 0
0.09-x = 0
(0.09-x)/(1-x) = 0
(0.09-x)/(1-x) = 0 // * 1-x
0.09-x = 0
0.09-x = 0 // - 0.09
-x = -0.09 // * -1
x = 0.09
x = 0.09
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