(2x-1)/(9-x^2)

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Solution for (2x-1)/(9-x^2) equation: 


D( x )

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

(2*x-1)/(9-x^2) = 0

2*x-1 = 0 // + 1

2*x = 1 // : 2

x = 1/2

x = 1/2

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