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k in (-oo:+oo)
(9*k)/12+8/12 = 7/12 // - 7/12
(9*k)/12+8/12-(7/12) = 0
(9*k)/12+8/12-7/12 = 0
3/4*k+1/12 = 0 // - 1/12
3/4*k = -1/12 // : 3/4
k = -1/12/3/4
k = -1/9
k = -1/9
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