(18-3X)/(X^2-9)

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Solution for (18-3X)/(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)

(18-(3*X))/(X^2-9) = 0

(18-3*X)/(X^2-9) = 0

18-3*X = 0 // - 18

-3*X = -18 // : -3

X = -18/(-3)

X = 6

X = 6

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