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D( x )
5*x-7 = 0
5*x-7 = 0
5*x-7 = 0
5*x-7 = 0 // + 7
5*x = 7 // : 5
x = 7/5
x in (-oo:7/5) U (7/5:+oo)
(9*x-5)/(5*x-7) = 0
9*x-5 = 0 // + 5
9*x = 5 // : 9
x = 5/9
x = 5/9
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