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p in (-oo:+oo)
(2/3)*p = p-9 // - p-9
(2/3)*p-p+9 = 0
9-1/3*p = 0 // - 9
-1/3*p = -9 // : -1/3
p = -9/(-1/3)
p = 27
p = 27
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