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k in (-oo:+oo)
23/24 = k+3/8 // - k+3/8
23/24-k-(3/8) = 0
23/24-k-3/8 = 0
7/12-k = 0 // - 7/12
-k = -7/12 // * -1
k = 7/12
k = 7/12
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