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k in (-oo:+oo)
(11/10)*k = 1/15-(1/14) // - 1/15-(1/14)
(11/10)*k-(1/15)+1/14 = 0
(11/10)*k-1/15+1/14 = 0
11/10*k+1/210 = 0 // - 1/210
11/10*k = -1/210 // : 11/10
k = -1/210/11/10
k = -1/231
k = -1/231
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