(x-9)/(x^2-9)

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Solution for (x-9)/(x^2-9) equation: 


D( x )

x^2-9 = 0

x^2-9 = 0

x^2-9 = 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 (-3:3) U (3:+oo)

(x-9)/(x^2-9) = 0

x-9 = 0 // + 9

x = 9

x = 9

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