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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) = 2.5 // - 2.5
x/(2-x)-2.5 = 0
x/(2-x)+(-2.5*(2-x))/(2-x) = 0
x-2.5*(2-x) = 0
3.5*x-5 = 0
(3.5*x-5)/(2-x) = 0
(3.5*x-5)/(2-x) = 0 // * 2-x
3.5*x-5 = 0
3.5*x-5 = 0 // + 5
3.5*x = 5 // : 3.5
x = 5/3.5
x = 1.42857143
x = 1.42857143
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