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k in (-oo:+oo)
(-7/9)*k = 1/18-(7/18) // - 1/18-(7/18)
(-7/9)*k-(1/18)+7/18 = 0
(-7/9)*k-1/18+7/18 = 0
1/3-7/9*k = 0 // - 1/3
-7/9*k = -1/3 // : -7/9
k = -1/3/(-7/9)
k = 3/7
k = 3/7
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