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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
12/(x-4) = 6 // - 6
12/(x-4)-6 = 0
12/(x-4)+(-6*(x-4))/(x-4) = 0
12-6*(x-4) = 0
36-6*x = 0
(36-6*x)/(x-4) = 0
(36-6*x)/(x-4) = 0 // * x-4
36-6*x = 0
36-6*x = 0 // - 36
-6*x = -36 // : -6
x = -36/(-6)
x = 6
x = 6
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