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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x^2 = (6*x)/x-9 // - (6*x)/x-9
2*x^2-((6*x)/x)+9 = 0
2*x^2-6+9 = 0
2*x^2 = -3 // : 2
x^2 = -3/2
x belongs to the empty set
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