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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4 = 2.4/x // - 2.4/x
4-(2.4/x) = 0
4-2.4*x^-1 = 0
-2.4*x^-1 = -4 // : -2.4
x^-1 = 1.66666667
-1 < 0
1/(x^1) = 1.66666667 // * x^1
1 = 1.66666667*x^1 // : 1.66666667
0.6 = x^1
x = 0.6
x = 0.6
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