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p in (-oo:+oo)
p^2 = (6/5)*p // - (6/5)*p
p^2-((6/5)*p) = 0
p^2+(-6/5)*p = 0
p^2-6/5*p = 0
DELTA = (-6/5)^2-(0*1*4)
DELTA = 36/25
DELTA > 0
p = ((36/25)^(1/2)+6/5)/(1*2) or p = (6/5-(36/25)^(1/2))/(1*2)
p = 6/5 or p = 0
p in { 0, 6/5 }
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