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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 1.2/2.4 // - 1.2/2.4
2/x-(1.2/2.4) = 0
2/x-0.5 = 0
2*x^-1 = 0.5 // : 2
x^-1 = 0.25
-1 < 0
1/(x^1) = 0.25 // * x^1
1 = 0.25*x^1 // : 0.25
4 = x^1
x = 4
x = 4
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