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