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k in (-oo:+oo)
(1/12)*k = 1/14-(11/9) // - 1/14-(11/9)
(1/12)*k-(1/14)+11/9 = 0
(1/12)*k-1/14+11/9 = 0
1/12*k+145/126 = 0 // - 145/126
1/12*k = -145/126 // : 1/12
k = -145/126/1/12
k = -290/21
k = -290/21
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