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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
5*p-(((2*(5/p)*p^2)/7)*p)-7 = 0
(-10/7)*p^2+5*p-7 = 0
5*p-10/7*p^2-7 = 0
DELTA = 5^2-(-7*(-10/7)*4)
DELTA = -15
DELTA < 0
p belongs to the empty set
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