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k in (-oo:+oo)
(15/14)*k = 1/10-(10/7) // - 1/10-(10/7)
(15/14)*k-(1/10)+10/7 = 0
(15/14)*k-1/10+10/7 = 0
15/14*k+93/70 = 0 // - 93/70
15/14*k = -93/70 // : 15/14
k = -93/70/15/14
k = -31/25
k = -31/25
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