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P in (-oo:+oo)
(P^2)/4-3 = 33 // - 33
(P^2)/4-33-3 = 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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