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D( x )
6-x = 0
6-x = 0
6-x = 0
6-x = 0 // - 6
-x = -6 // * -1
x = 6
x in (-oo:6) U (6:+oo)
(((9-x)*(x-6))/(6-x))*(x-9) = 0
((9-x)*(x-6)*(x-9))/(6-x) = 0
( 9-x )
9-x = 0 // - 9
-x = -9 // * -1
x = 9
( x-6 )
x-6 = 0 // + 6
x = 6
( x-9 )
x-9 = 0 // + 9
x = 9
x in { 6}
x in { 9, 9 }
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