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