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D( x )
x+6 = 0
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:+oo)
6*x-((60/(x+6))*(x-6)) = 0
6*x-60*(x-6)*(x+6)^-1 = 0
(-60*(x-6))/(x+6)+6*x = 0
(-60*(x-6))/(x+6)+(6*x*(x+6))/(x+6) = 0
6*x*(x+6)-60*(x-6) = 0
6*x^2-24*x+360 = 0
6*x^2-24*x+360 = 0
6*(x^2-4*x+60) = 0
x^2-4*x+60 = 0
DELTA = (-4)^2-(1*4*60)
DELTA = -224
DELTA < 0
6 = 0
6/(x+6) = 0
6/(x+6) = 0 // * x+6
6 = 0
x belongs to the empty set
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