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D( x )
x-5 = 0
5-x = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
5-x = 0
5-x = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x in (-oo:5) U (5:+oo)
5/(5-x)-(2/(x-5)) = 0
5/(5-x)-2*(x-5)^-1 = 0
5/(5-x)-2/(x-5) = 0
(5*(x-5))/((5-x)*(x-5))+(-2*(5-x))/((5-x)*(x-5)) = 0
5*(x-5)-2*(5-x) = 0
7*x-35 = 0
(7*x-35)/((5-x)*(x-5)) = 0
(7*x-35)/((5-x)*(x-5)) = 0 // * (5-x)*(x-5)
7*x-35 = 0
7*x-35 = 0 // + 35
7*x = 35 // : 7
x = 35/7
x = 5
x in { 5}
x belongs to the empty set
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