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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 8/15 // - 8/15
5/x-(8/15) = 0
5/x-8/15 = 0
5*x^-1 = 8/15 // : 5
x^-1 = 8/75
-1 < 0
1/(x^1) = 8/75 // * x^1
1 = 8/75*x^1 // : 8/75
75/8 = x^1
x = 75/8
x = 75/8
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