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p in (-oo:+oo)
((-1/2)*p-5+6)^2 = 0
(1-1/2*p)^2 = 0
1-1/2*p = 0 // - 1
-1/2*p = -1 // : -1/2
p = -1/(-1/2)
p = 2
p in { 2, 2 }
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