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p in (-oo:+oo)
(1/4)*p^2-3 = 33 // - 33
(1/4)*p^2-33-3 = 0
1/4*p^2 = 36 // : 1/4
p^2 = 144
p^2 = 144 // ^ 1/2
abs(p) = 12
p = 12 or p = -12
p in { 12, -12 }
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