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k in (-oo:+oo)
(7/3)*k = 7/18 // - 7/18
(7/3)*k-(7/18) = 0
(7/3)*k-7/18 = 0
7/3*k-7/18 = 0 // + 7/18
7/3*k = 7/18 // : 7/3
k = 7/18/7/3
k = 1/6
k = 1/6
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