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p in (-oo:+oo)
5/7 = (p^4)/7 // - (p^4)/7
5/7-((p^4)/7) = 0
-1/7*p^4 = -5/7 // : -1/7
p^4 = 5
p^4 = 5 // ^ 1/4
abs(p) = 5^(1/4)
p = 5^(1/4) or p = -5^(1/4)
p in { 5^(1/4), -5^(1/4) }
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