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D( x )
7*x-5 = 0
7*x-5 = 0
7*x-5 = 0
7*x-5 = 0 // + 5
7*x = 5 // : 7
x = 5/7
x in (-oo:5/7) U (5/7:+oo)
(5*x-6)/(7*x-5) = 0
5*x-6 = 0 // + 6
5*x = 6 // : 5
x = 6/5
x = 6/5
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