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D( x )
4-x = 0
4-x = 0
4-x = 0
4-x = 0 // - 4
-x = -4 // * -1
x = 4
x in (-oo:4) U (4:+oo)
(4*x-9)/(4-x) = 0
4*x-9 = 0 // + 9
4*x = 9 // : 4
x = 9/4
x = 9/4
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