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k in (-oo:+oo)
(23/4)*k+3/4+6 = 64/5 // - 64/5
(23/4)*k+3/4-(64/5)+6 = 0
(23/4)*k+3/4-64/5+6 = 0
23/4*k-121/20 = 0 // + 121/20
23/4*k = 121/20 // : 23/4
k = 121/20/23/4
k = 121/115
k = 121/115
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