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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
3/(x-3) = x/(x-3)+5 // - x/(x-3)+5
3/(x-3)-(x/(x-3))-5 = 0
3/(x-3)+(-1*x)/(x-3)-5 = 0
3/(x-3)+(-1*x)/(x-3)+(-5*(x-3))/(x-3) = 0
3-5*(x-3)-1*x = 0
3-x-5*x+15 = 0
18-6*x = 0
(18-6*x)/(x-3) = 0
(18-6*x)/(x-3) = 0 // * x-3
18-6*x = 0
18-6*x = 0 // - 18
-6*x = -18 // : -6
x = -18/(-6)
x = 3
x in { 3}
x belongs to the empty set
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