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p in (-oo:+oo)
43 = (2*p^2)/3-7 // - (2*p^2)/3-7
7-((2*p^2)/3)+43 = 0
(-2/3)*p^2+7+43 = 0
-2/3*p^2 = -50 // : -2/3
p^2 = 75
p^2 = 75 // ^ 1/2
abs(p) = 5*3^(1/2)
p = 5*3^(1/2) or p = -(5*3^(1/2))
p in { 5*3^(1/2), -(5*3^(1/2)) }
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