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D( x )
6*x-18 = 0
2*x-6 = 0
6*x-18 = 0
6*x-18 = 0
6*x-18 = 0 // + 18
6*x = 18 // : 6
x = 18/6
x = 3
2*x-6 = 0
2*x-6 = 0
2*x-6 = 0 // + 6
2*x = 6 // : 2
x = 6/2
x = 3
x in (-oo:3) U (3:+oo)
(X^2)/(2*x-6) = 9/(6*x-18) // - 9/(6*x-18)
(X^2)/(2*x-6)-(9/(6*x-18)) = 0
(X^2)/(2*x-6)-9*(6*x-18)^-1 = 0
(X^2)/(2*x-6)-9/(6*x-18) = 0
(X^2*(6*x-18))/((2*x-6)*(6*x-18))+(-9*(2*x-6))/((2*x-6)*(6*x-18)) = 0
X^2*(6*x-18)-9*(2*x-6) = 0
6*X^2*x-18*X^2-18*x+54 = 0
(6*X^2*x-18*X^2-18*x+54)/((2*x-6)*(6*x-18)) = 0
(6*X^2*x-18*X^2-18*x+54)/((2*x-6)*(6*x-18)) = 0 // * (2*x-6)*(6*x-18)
6*X^2*x-18*X^2-18*x+54 = 0
54-18*X^2-18*x = 0 // - 54-18*X^2
-18*x = -(54-18*X^2) // : -18
x = (-(54-18*X^2))/(-18)
x = (54-18*X^2)/18
x = (54-18*X^2)/18
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