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