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D( x )
4*x-9 = 0
4*x-9 = 0
4*x-9 = 0
4*x-9 = 0 // + 9
4*x = 9 // : 4
x = 9/4
x in (-oo:9/4) U (9/4:+oo)
(9*x-25)/(4*x-9) = 0
9*x-25 = 0 // + 25
9*x = 25 // : 9
x = 25/9
x = 25/9
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