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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
93/x = 3/15 // - 3/15
93/x-(3/15) = 0
93/x-1/5 = 0
93*x^-1 = 1/5 // : 93
x^-1 = 1/465
-1 < 0
1/(x^1) = 1/465 // * x^1
1 = 1/465*x^1 // : 1/465
465 = x^1
x = 465
x = 465
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