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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)
(4*x-9)/(6-x) = 0
4*x-9 = 0 // + 9
4*x = 9 // : 4
x = 9/4
x = 9/4
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