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k in (-oo:+oo)
(3/8)*k = 3/2 // - 3/2
(3/8)*k-(3/2) = 0
(3/8)*k-3/2 = 0
3/8*k-3/2 = 0 // + 3/2
3/8*k = 3/2 // : 3/8
k = 3/2/3/8
k = 4
k = 4
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