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k in (-oo:+oo)
(7/9)*k = 2/3 // - 2/3
(7/9)*k-(2/3) = 0
(7/9)*k-2/3 = 0
7/9*k-2/3 = 0 // + 2/3
7/9*k = 2/3 // : 7/9
k = 2/3/7/9
k = 6/7
k = 6/7
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