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D( x )
6*x^2-54 = 0
6*x^2-54 = 0
6*x^2-54 = 0
6*x^2 = 54 // : 6
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-6)/(6*x^2-54) = 0
2*x-6 = 0 // + 6
2*x = 6 // : 2
x = 6/2
x = 3
x in { 3}
x belongs to the empty set
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