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p in (-oo:+oo)
(8/2)*p^2+4*p-8 = 0
4*p^2+4*p-8 = 0
DELTA = 4^2-(-8*4*4)
DELTA = 144
DELTA > 0
p = (144^(1/2)-4)/(2*4) or p = (-144^(1/2)-4)/(2*4)
p = 1 or p = -2
p in { -2, 1 }
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