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D( x )
9-x = 0
9-x = 0
9-x = 0
9-x = 0 // - 9
-x = -9 // * -1
x = 9
x in (-oo:9) U (9:+oo)
(x^2-3)/(9-x) = 0
1*x^2 = 3 // : 1
x^2 = 3
x^2 = 3 // ^ 1/2
abs(x) = 3^(1/2)
x = 3^(1/2) or x = -3^(1/2)
x in { 3^(1/2), -3^(1/2) }
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