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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
5*p-((7/3)*p^2)-(((5/p)/7)*p) = 0
(-7/3)*p^2+5*p-5/7 = 0
5*p-7/3*p^2-5/7 = 0
DELTA = 5^2-(-7/3*(-5/7)*4)
DELTA = 55/3
DELTA > 0
p = ((55/3)^(1/2)-5)/(-7/3*2) or p = (-(55/3)^(1/2)-5)/(-7/3*2)
p = -3/14*((55/3)^(1/2)-5) or p = 3/14*((55/3)^(1/2)+5)
p in { -3/14*((55/3)^(1/2)-5), 3/14*((55/3)^(1/2)+5) }
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