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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)
x/(2-x) = 1.25 // - 1.25
x/(2-x)-1.25 = 0
x/(2-x)+(-1.25*(2-x))/(2-x) = 0
x-1.25*(2-x) = 0
2.25*x-2.5 = 0
(2.25*x-2.5)/(2-x) = 0
(2.25*x-2.5)/(2-x) = 0 // * 2-x
2.25*x-2.5 = 0
2.25*x-2.5 = 0 // + 2.5
2.25*x = 2.5 // : 2.25
x = 2.5/2.25
x = 1.11111111
x = 1.11111111
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