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D( x )
x-6 = 0
x^2-36 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x^2-36 = 0
x^2-36 = 0
1*x^2 = 36 // : 1
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in (-oo:-6) U (-6:6) U (6:+oo)
(2*x)/(x^2-36)-(1/(x-6)) = 0
(2*x)/(x^2-36)-(x-6)^-1 = 0
(2*x)/(x^2-36)-1/(x-6) = 0
(2*x*(x-6))/((x^2-36)*(x-6))+(-1*(x^2-36))/((x^2-36)*(x-6)) = 0
2*x*(x-6)-1*(x^2-36) = 0
x^2-12*x+36 = 0
x^2-12*x+36 = 0
x^2-12*x+36 = 0
DELTA = (-12)^2-(1*4*36)
DELTA = 0
x = 12/(1*2)
x = 6 or x = 6
(x-6)^2 = 0
((x-6)^2)/((x^2-36)*(x-6)) = 0
((x-6)^2)/((x^2-36)*(x-6)) = 0 // * (x^2-36)*(x-6)
(x-6)^2 = 0
x-6 = 0 // + 6
x = 6
x in { 6}
x belongs to the empty set
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