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c in (-oo:+oo)
(-1/2)*e^-4*c*c = 1 // - 1
(-1/2)*e^-4*c*c-1 = 0
-1/2*e^-4*c^2 = 1 // : -1/2*e^-4
c^2 = -2*e^4
c belongs to the empty set
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