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k in (-oo:+oo)
(1/2)*k = 3.2 // - 3.2
(1/2)*k-3.2 = 0
1/2*k-3.2 = 0 // + 3.2
1/2*k = 3.2 // : 1/2
k = 3.2/1/2
k = 6.4
k = 6.4
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