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D( x )
1*x-65 = 0
1*x-65 = 0
1*x-65 = 0
x-65 = 0
x-65 = 0 // + 65
x = 65
x in (-oo:65) U (65:+oo)
(3*x-65)/(1*x-65) = 3 // - 3
(3*x-65)/(1*x-65)-3 = 0
(3*x-65)/(x-65)-3 = 0
(3*x-65)/(x-65)+(-3*(x-65))/(x-65) = 0
3*x-3*(x-65)-65 = 0
130 = 0
130/(x-65) = 0
130/(x-65) = 0 // * x-65
130 = 0
130 = 0
x belongs to the empty set
x belongs to the empty set
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