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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y-(2.4/x) = 1 // - 1
y-(2.4/x)-1 = 0
y-2.4*x^-1-1 = 0
-2.4*x^-1 = -(y-1) // : -2.4
x^-1 = -0.41666667*(1-y)
-1 < 0
1/(x^1) = -0.41666667*(1-y) // * x^1
1 = -0.41666667*x^1*(1-y) // : -0.41666667*(1-y)
-2.39999998*(1-y)^-1 = x^1
x = -2.39999998*(1-y)^-1
x = -2.39999998*(1-y)^-1
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