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k in (-oo:+oo)
(4/6)*k = 7/9 // - 7/9
(4/6)*k-(7/9) = 0
(4/6)*k-7/9 = 0
2/3*k-7/9 = 0 // + 7/9
2/3*k = 7/9 // : 2/3
k = 7/9/2/3
k = 7/6
k = 7/6
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