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D( x )
5-x = 0
x-9 = 0
5-x = 0
5-x = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x-9 = 0
x-9 = 0
x-9 = 0 // + 9
x = 9
x in (-oo:5) U (5:9) U (9:+oo)
5/(5-x)-(6/(x-9)) = 0
5/(5-x)-6*(x-9)^-1 = 0
5/(5-x)-6/(x-9) = 0
(5*(x-9))/((5-x)*(x-9))+(-6*(5-x))/((5-x)*(x-9)) = 0
5*(x-9)-6*(5-x) = 0
11*x-75 = 0
(11*x-75)/((5-x)*(x-9)) = 0
(11*x-75)/((5-x)*(x-9)) = 0 // * (5-x)*(x-9)
11*x-75 = 0
11*x-75 = 0 // + 75
11*x = 75 // : 11
x = 75/11
x = 75/11
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