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p in (-oo:+oo)
p^2-(3*p)+9/4 = 0
p^2-3*p+9/4 = 0
p^2-3*p+9/4 = 0
DELTA = (-3)^2-(1*9/4*4)
DELTA = 0
p = 3/(1*2)
p = 3/2 or p = 3/2
p in { 3/2, 3/2 }
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