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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
5/(x-3)-6 = 12/(x-3) // - 12/(x-3)
5/(x-3)-(12/(x-3))-6 = 0
5/(x-3)-12*(x-3)^-1-6 = 0
5/(x-3)-12/(x-3)-6 = 0
5/(x-3)-12/(x-3)+(-6*(x-3))/(x-3) = 0
5-6*(x-3)-12 = 0
18-6*x-7 = 0
11-6*x = 0
(11-6*x)/(x-3) = 0
(11-6*x)/(x-3) = 0 // * x-3
11-6*x = 0
11-6*x = 0 // - 11
-6*x = -11 // : -6
x = -11/(-6)
x = 11/6
x = 11/6
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