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D( x )
x^2-25 = 0
x^2-25 = 0
x^2-25 = 0
1*x^2 = 25 // : 1
x^2 = 25
x^2 = 25 // ^ 1/2
abs(x) = 5
x = 5 or x = -5
x in (-oo:-5) U (-5:5) U (5:+oo)
(5-(9*x))/(x^2-25) = 0
(5-9*x)/(x^2-25) = 0
5-9*x = 0 // - 5
-9*x = -5 // : -9
x = -5/(-9)
x = 5/9
x = 5/9
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