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k in (-oo:+oo)
(-6/7)*k+8/9 = 5*k-(2158/63) // - 5*k-(2158/63)
(-6/7)*k-(5*k)+8/9+2158/63 = 0
(-6/7)*k-5*k+8/9+2158/63 = 0
246/7-41/7*k = 0 // - 246/7
-41/7*k = -246/7 // : -41/7
k = -246/7/(-41/7)
k = 6
k = 6
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