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D( x )
x = 0
x-3 = 0
x = 0
x = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:0) U (0:3) U (3:+oo)
6/(x-3) = 5/x-6+1 // - 5/x-6+1
6/(x-3)-(5/x)-1+6 = 0
6/(x-3)-5*x^-1-1+6 = 0
6/(x-3)-5/x-1+6 = 0
(6*x)/(x*(x-3))+(-5*(x-3))/(x*(x-3))+(-1*x*(x-3))/(x*(x-3))+(6*x*(x-3))/(x*(x-3)) = 0
6*x*(x-3)-5*(x-3)-1*x*(x-3)+6*x = 0
6*x^2-x^2+x+3*x-18*x+15 = 0
6*x^2-x^2+4*x-18*x+15 = 0
5*x^2-14*x+15 = 0
5*x^2-14*x+15 = 0
5*x^2-14*x+15 = 0
DELTA = (-14)^2-(4*5*15)
DELTA = -104
DELTA < 0
1 = 0
1/(x*(x-3)) = 0
1/(x*(x-3)) = 0 // * x*(x-3)
1 = 0
x belongs to the empty set
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