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p in (-oo:+oo)
(p^2-p)/2-171 = 0
(p^2-p)/2+(-171*2)/2 = 0
p^2-p-171*2 = 0
p^2-p-342 = 0
p^2-p-342 = 0
p^2-p-342 = 0
DELTA = (-1)^2-(-342*1*4)
DELTA = 1369
DELTA > 0
p = (1369^(1/2)+1)/(1*2) or p = (1-1369^(1/2))/(1*2)
p = 19 or p = -18
(p+18)*(p-19) = 0
((p+18)*(p-19))/2 = 0
((p+18)*(p-19))/2 = 0 // * 2
(p+18)*(p-19) = 0
( p+18 )
p+18 = 0 // - 18
p = -18
( p-19 )
p-19 = 0 // + 19
p = 19
p in { -18, 19 }
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