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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
(4*p)/p-((4*p)/5)-p-5 = 0
(-4/5)*p-p+(4*p)/p-5 = 0
-9/5*p-1 = 0 // + 1
-9/5*p = 1 // : -9/5
p = 1/(-9/5)
p = -5/9
p = -5/9
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