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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9*x-15)/x-3 = 0
(9*x-15)/x+(-3*x)/x = 0
9*x-3*x-15 = 0
6*x-15 = 0
(6*x-15)/x = 0
(6*x-15)/x = 0 // * x
6*x-15 = 0
6*x-15 = 0 // + 15
6*x = 15 // : 6
x = 15/6
x = 5/2
x = 5/2
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