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k in (-oo:+oo)
(2/3)*k+(1/4)*k = 23 // - 23
(2/3)*k+(1/4)*k-23 = 0
11/12*k-23 = 0 // + 23
11/12*k = 23 // : 11/12
k = 23/11/12
k = 276/11
k = 276/11
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