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k in (-oo:+oo)
(6/5)*k-8/7 = -((1/8)*k)-9 // + -((1/8)*k)-9
(6/5)*k+(1/8)*k-8/7+9 = 0
53/40*k+55/7 = 0 // - 55/7
53/40*k = -55/7 // : 53/40
k = -55/7/53/40
k = -2200/371
k = -2200/371
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