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D( x )
3-x = 0
x-3 = 0
3-x = 0
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
17/(3-x)+5/(x-3) = 0
(17*(x-3))/((3-x)*(x-3))+(5*(3-x))/((3-x)*(x-3)) = 0
17*(x-3)+5*(3-x) = 0
12*x-36 = 0
(12*x-36)/((3-x)*(x-3)) = 0
(12*x-36)/((3-x)*(x-3)) = 0 // * (3-x)*(x-3)
12*x-36 = 0
12*x-36 = 0 // + 36
12*x = 36 // : 12
x = 36/12
x = 3
x in { 3}
x belongs to the empty set
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