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p in (-oo:+oo)
6-((p^2)/8) = -4 // + 4
4-((p^2)/8)+6 = 0
-1/8*p^2 = -10 // : -1/8
p^2 = 80
p^2 = 80 // ^ 1/2
abs(p) = 4*5^(1/2)
p = 4*5^(1/2) or p = -(4*5^(1/2))
p in { 4*5^(1/2), -(4*5^(1/2)) }
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