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c in (-oo:+oo)
(c^2)/8-3 = 2 // - 2
(c^2)/8-3-2 = 0
1/8*c^2 = 5 // : 1/8
c^2 = 40
c^2 = 40 // ^ 1/2
abs(c) = 2*10^(1/2)
c = 2*10^(1/2) or c = -(2*10^(1/2))
c in { 2*10^(1/2), -(2*10^(1/2)) }
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