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k in (-oo:+oo)
(5/7)*k+4/5 = -((8/9)*k)-2 // + -((8/9)*k)-2
(5/7)*k+(8/9)*k+4/5+2 = 0
101/63*k+14/5 = 0 // - 14/5
101/63*k = -14/5 // : 101/63
k = -14/5/101/63
k = -882/505
k = -882/505
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