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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)
y = x/(x-5) // - x/(x-5)
y-(x/(x-5)) = 0
(-1*x)/(x-5)+y = 0
(-1*x)/(x-5)+(y*(x-5))/(x-5) = 0
y*(x-5)-1*x = 0
x*y-x-5*y = 0
x*y-x-5*y = 0
x*y-5*y = 0 // + -5*y
x*y = -(-5*y) // : y
x = (-(-5*y))/y
x = 5
x-5 = 0
(x-5)/(x-5) = 0
(x-5)/(x-5) = 0 // * x-5
x-5 = 0
x-5 = 0 // + 5
x = 5
x in { 5}
x belongs to the empty set
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