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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
x/(x-6)+6 = 6/(x-6) // - 6/(x-6)
x/(x-6)-(6/(x-6))+6 = 0
x/(x-6)-6*(x-6)^-1+6 = 0
x/(x-6)-6/(x-6)+6 = 0
x/(x-6)-6/(x-6)+(6*(x-6))/(x-6) = 0
6*(x-6)+x-6 = 0
x+6*x-36-6 = 0
7*x-42 = 0
(7*x-42)/(x-6) = 0
(7*x-42)/(x-6) = 0 // * x-6
7*x-42 = 0
7*x-42 = 0 // + 42
7*x = 42 // : 7
x = 42/7
x = 6
x in { 6}
x belongs to the empty set
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