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k in (-oo:+oo)
k/4 = 11/8 // - 11/8
k/4-(11/8) = 0
k/4-11/8 = 0
1/4*k-11/8 = 0 // + 11/8
1/4*k = 11/8 // : 1/4
k = 11/8/1/4
k = 11/2
k = 11/2
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