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p in (-oo:+oo)
(1/4)*p^2 = 9 // - 9
(1/4)*p^2-9 = 0
1/4*p^2 = 9 // : 1/4
p^2 = 36
p^2 = 36 // ^ 1/2
abs(p) = 6
p = 6 or p = -6
p in { 6, -6 }
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