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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/(1-x) = 2.4 // - 2.4
1/(1-x)-2.4 = 0
1/(1-x)+(-2.4*(1-x))/(1-x) = 0
1-2.4*(1-x) = 0
2.4*x-1.4 = 0
(2.4*x-1.4)/(1-x) = 0
(2.4*x-1.4)/(1-x) = 0 // * 1-x
2.4*x-1.4 = 0
2.4*x-1.4 = 0 // + 1.4
2.4*x = 1.4 // : 2.4
x = 1.4/2.4
x = 0.58333333
x = 0.58333333
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