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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6*x^2-((54*x)/x)-9 = 0
6*x^2-54-9 = 0
6*x^2 = 63 // : 6
x^2 = 21/2
x^2 = 21/2 // ^ 1/2
abs(x) = (21/2)^(1/2)
x = (21/2)^(1/2) or x = -(21/2)^(1/2)
x in { (21/2)^(1/2), -(21/2)^(1/2) }
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