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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 4/3 // - 4/3
5/x-(4/3) = 0
5/x-4/3 = 0
5*x^-1 = 4/3 // : 5
x^-1 = 4/15
-1 < 0
1/(x^1) = 4/15 // * x^1
1 = 4/15*x^1 // : 4/15
15/4 = x^1
x = 15/4
x = 15/4
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