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D( p )
7*p-9 = 0
7*p-9 = 0
7*p-9 = 0
7*p-9 = 0 // + 9
7*p = 9 // : 7
p = 9/7
p in (-oo:9/7) U (9/7:+oo)
(4*p-7)/(7*p-9) = 0
4*p-7 = 0 // + 7
4*p = 7 // : 4
p = 7/4
p = 7/4
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