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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
2*p-(((2*(2/p)*p^2)/7)*p)-p = 0
(-4/7)*p^2+2*p-p = 0
p-4/7*p^2 = 0
DELTA = 1^2-(-4/7*0*4)
DELTA = 1
DELTA > 0
p = (1^(1/2)-1)/(-4/7*2) or p = (-1^(1/2)-1)/(-4/7*2)
p = 0 or p = 7/4
p in { 0}
p = 7/4
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