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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)
(2*x)/(x-6) = 12/(x-6) // - 12/(x-6)
(2*x)/(x-6)-(12/(x-6)) = 0
(2*x)/(x-6)-12*(x-6)^-1 = 0
(2*x)/(x-6)-12/(x-6) = 0
2*x-12 = 0
(2*x-12)/(x-6) = 0
(2*x-12)/(x-6) = 0 // * x-6
2*x-12 = 0
2*x-12 = 0 // + 12
2*x = 12 // : 2
x = 12/2
x = 6
x in { 6}
x belongs to the empty set
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