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k in (-oo:+oo)
(1/12)*k = 1/15-(13/14) // - 1/15-(13/14)
(1/12)*k-(1/15)+13/14 = 0
(1/12)*k-1/15+13/14 = 0
1/12*k+181/210 = 0 // - 181/210
1/12*k = -181/210 // : 1/12
k = -181/210/1/12
k = -362/35
k = -362/35
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