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