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D( x )
3*x-18 = 0
3*x-18 = 0
3*x-18 = 0
3*x-18 = 0 // + 18
3*x = 18 // : 3
x = 18/3
x = 6
x in (-oo:6) U (6:+oo)
(x^2-(6*x))/(3*x-18) = 2 // - 2
(x^2-(6*x))/(3*x-18)-2 = 0
(x^2-6*x)/(3*x-18)-2 = 0
(x^2-6*x)/(3*x-18)+(-2*(3*x-18))/(3*x-18) = 0
x^2-2*(3*x-18)-6*x = 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)/(3*x-18) = 0
((x-6)^2)/(3*x-18) = 0 // * 3*x-18
(x-6)^2 = 0
x-6 = 0 // + 6
x = 6
x in { 6}
x belongs to the empty set
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