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p in (-oo:+oo)
(1/3)*p-14 = p+13 // - p+13
(1/3)*p-p-14-13 = 0
-2/3*p-27 = 0 // + 27
-2/3*p = 27 // : -2/3
p = 27/(-2/3)
p = -81/2
p = -81/2
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