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p in (-oo:+oo)
(1/3)*p-((2/3)*p)+6 = 0
(1/3)*p+(-2/3)*p+6 = 0
6-1/3*p = 0 // - 6
-1/3*p = -6 // : -1/3
p = -6/(-1/3)
p = 18
p = 18
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