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k in (-oo:+oo)
(5/7)*k+7/5 = -((1/9)*k)-2 // + -((1/9)*k)-2
(5/7)*k+(1/9)*k+7/5+2 = 0
52/63*k+17/5 = 0 // - 17/5
52/63*k = -17/5 // : 52/63
k = -17/5/52/63
k = -1071/260
k = -1071/260
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