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D( x )
x-6 = 0
x-4 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:6) U (6:+oo)
x/(x-6) = 7/(x-4) // - 7/(x-4)
x/(x-6)-(7/(x-4)) = 0
x/(x-6)-7*(x-4)^-1 = 0
x/(x-6)-7/(x-4) = 0
(x*(x-4))/((x-6)*(x-4))+(-7*(x-6))/((x-6)*(x-4)) = 0
x*(x-4)-7*(x-6) = 0
x^2-11*x+42 = 0
x^2-11*x+42 = 0
x^2-11*x+42 = 0
DELTA = (-11)^2-(1*4*42)
DELTA = -47
DELTA < 0
1 = 0
1/((x-6)*(x-4)) = 0
1/((x-6)*(x-4)) = 0 // * (x-6)*(x-4)
1 = 0
x belongs to the empty set
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