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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*x = (12*x^2)/x-x-5+5 // - (12*x^2)/x-x-5+5
5*x+x-((12*x^2)/x)-5+5 = 0
5*x+x-12*x-5+5 = 0
-6*x = 0 // : -6
x = 0
x in { 0}
x belongs to the empty set
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