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D( x )
6-(2*x) = 0
(5*x)/(9-x^2) = 0
9-x^2 = 0
6-(2*x) = 0
6-(2*x) = 0
6-2*x = 0
6-2*x = 0 // - 6
-2*x = -6 // : -2
x = -6/(-2)
x = 3
(5*x)/(9-x^2) = 0
(5*x)/(9-x^2) = 0
5*x = 0 // : 5
x = 0
9-x^2 = 0
9-x^2 = 0
-1*x^2 = -9 // : -1
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in (-oo:-3) U (-3:0) U (0:3) U (3:+oo)
(3/(6-(2*x)))/((5*x)/(9-x^2)) = 0
(3/(6-2*x))/((5*x)/(9-x^2)) = 0
(3*(9-x^2))/(5*x*(6-2*x)) = 0
-1*x^2 = -9 // : -1
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in { 3}
x in { -3}
x belongs to the empty set
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