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p in (-oo:+oo)
(p^1)/3 = 7 // - 7
(p^1)/3-7 = 0
p/3-7 = 0
1/3*p-7 = 0 // + 7
1/3*p = 7 // : 1/3
p = 7/1/3
p = 21
p = 21
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