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c in (-oo:+oo)
(2/3)*c^18 = 7 // - 7
(2/3)*c^18-7 = 0
2/3*c^18 = 7 // : 2/3
c^18 = 21/2
c^18 = 21/2 // ^ 1/18
abs(c) = (21/2)^(1/18)
c = (21/2)^(1/18) or c = -(21/2)^(1/18)
c in { (21/2)^(1/18), -(21/2)^(1/18) }
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