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