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k in (-oo:+oo)
(3/4)*k-5 = 8 // - 8
(3/4)*k-8-5 = 0
3/4*k-13 = 0 // + 13
3/4*k = 13 // : 3/4
k = 13/3/4
k = 52/3
k = 52/3
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