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