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k in (-oo:+oo)
29/12 = k+13/4 // - k+13/4
29/12-k-(13/4) = 0
29/12-k-13/4 = 0
-k-5/6 = 0 // + 5/6
-k = 5/6 // * -1
k = -5/6
k = -5/6
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