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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
(3*x)/(x-5) = 3 // - 3
(3*x)/(x-5)-3 = 0
(3*x)/(x-5)+(-3*(x-5))/(x-5) = 0
3*x-3*(x-5) = 0
15 = 0
15/(x-5) = 0
15/(x-5) = 0 // * x-5
15 = 0
x belongs to the empty set
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