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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-(11*x)-12)/(x-3) = 0
(5*x-11*x-12)/(x-3) = 0
(-6*x-12)/(x-3) = 0
-6*x-12 = 0 // + 12
-6*x = 12 // : -6
x = 12/(-6)
x = -2
x = -2
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