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D( x )
2-x = 0
2-x = 0
2-x = 0
2-x = 0 // - 2
-x = -2 // * -1
x = 2
x in (-oo:2) U (2:+oo)
(2*x)/(2-x) = 91 // - 91
(2*x)/(2-x)-91 = 0
(2*x)/(2-x)+(-91*(2-x))/(2-x) = 0
2*x-91*(2-x) = 0
93*x-182 = 0
(93*x-182)/(2-x) = 0
(93*x-182)/(2-x) = 0 // * 2-x
93*x-182 = 0
93*x-182 = 0 // + 182
93*x = 182 // : 93
x = 182/93
x = 182/93
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