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p in (-oo:+oo)
p^2-((36/2)*p) = 0
p^2-18*p = 0
p^2-18*p = 0
DELTA = (-18)^2-(0*1*4)
DELTA = 324
DELTA > 0
p = (324^(1/2)+18)/(1*2) or p = (18-324^(1/2))/(1*2)
p = 18 or p = 0
p in { 0, 18 }
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