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p in (-oo:+oo)
5*p^2-(((5*p)/7)*p)-7 = 0
5*p^2+(-5/7)*p^2-7 = 0
30/7*p^2 = 7 // : 30/7
p^2 = 49/30
p^2 = 49/30 // ^ 1/2
abs(p) = (49/30)^(1/2)
p = (49/30)^(1/2) or p = -(49/30)^(1/2)
p in { (49/30)^(1/2), -(49/30)^(1/2) }
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