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n in (-oo:+oo)
7/63 = n^18 // - n^18
7/63-n^18 = 0
-1*n^18 = -1/9 // : -1
n^18 = 1/9
n^18 = 1/9 // ^ 1/18
abs(n) = (1/9)^(1/18)
n = (1/9)^(1/18) or n = -(1/9)^(1/18)
n in { (1/9)^(1/18), -(1/9)^(1/18) }
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