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c in (-oo:+oo)
(c^2)/15 = 88 // - 88
(c^2)/15-88 = 0
1/15*c^2 = 88 // : 1/15
c^2 = 1320
c^2 = 1320 // ^ 1/2
abs(c) = 2*330^(1/2)
c = 2*330^(1/2) or c = -(2*330^(1/2))
c in { 2*330^(1/2), -(2*330^(1/2)) }
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