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p in (-oo:+oo)
1 = (20/6)*p-((12/6)*p)+27/6 // - (20/6)*p-((12/6)*p)+27/6
(12/6)*p-((20/6)*p)-(27/6)+1 = 0
(12/6)*p+(-10/3)*p-9/2+1 = 0
-4/3*p-7/2 = 0 // + 7/2
-4/3*p = 7/2 // : -4/3
p = 7/2/(-4/3)
p = -21/8
p = -21/8
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