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p in (-oo:+oo)
6 = (p^2)/7 // - (p^2)/7
6-((p^2)/7) = 0
-1/7*p^2 = -6 // : -1/7
p^2 = 42
p^2 = 42 // ^ 1/2
abs(p) = 42^(1/2)
p = 42^(1/2) or p = -42^(1/2)
p in { 42^(1/2), -42^(1/2) }
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