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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)
-5/(x-4) = 5 // - 5
-5/(x-4)-5 = 0
(-5*(x-4))/(x-4)-5/(x-4) = 0
-5*(x-4)-5 = 0
15-5*x = 0
(15-5*x)/(x-4) = 0
(15-5*x)/(x-4) = 0 // * x-4
15-5*x = 0
15-5*x = 0 // - 15
-5*x = -15 // : -5
x = -15/(-5)
x = 3
x = 3
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