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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30/x = (8/13)/5 // - (8/13)/5
30/x-((8/13)/5) = 0
30/x-8/65 = 0
30*x^-1 = 8/65 // : 30
x^-1 = 4/975
-1 < 0
1/(x^1) = 4/975 // * x^1
1 = 4/975*x^1 // : 4/975
975/4 = x^1
x = 975/4
x = 975/4
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