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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
9/(x-1) = 11/(x-1)+3 // - 11/(x-1)+3
9/(x-1)-(11/(x-1))-3 = 0
9/(x-1)-11*(x-1)^-1-3 = 0
9/(x-1)-11/(x-1)-3 = 0
9/(x-1)-11/(x-1)+(-3*(x-1))/(x-1) = 0
9-3*(x-1)-11 = 0
3-3*x-2 = 0
1-3*x = 0
(1-3*x)/(x-1) = 0
(1-3*x)/(x-1) = 0 // * x-1
1-3*x = 0
1-3*x = 0 // - 1
-3*x = -1 // : -3
x = -1/(-3)
x = 1/3
x = 1/3
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