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D( p )
16*p-80 = 0
16*p-80 = 0
16*p-80 = 0
16*p-80 = 0 // + 80
16*p = 80 // : 16
p = 80/16
p = 5
p in (-oo:5) U (5:+oo)
(7-8*p)/(16*p-80) = 0
7-8*p = 0 // - 7
-8*p = -7 // : -8
p = -7/(-8)
p = 7/8
p = 7/8
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