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k in (-oo:+oo)
k/4 = 3/8 // - 3/8
k/4-(3/8) = 0
k/4-3/8 = 0
1/4*k-3/8 = 0 // + 3/8
1/4*k = 3/8 // : 1/4
k = 3/8/1/4
k = 3/2
k = 3/2
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