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k in (-oo:+oo)
e^5*k = 1/2 // - 1/2
e^5*k-(1/2) = 0
e^5*k-1/2 = 0
e^5*k-1/2 = 0 // + 1/2
e^5*k = 1/2 // : e^5
k = 1/2/(e^5)
k = 1/2/(e^5)
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