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k in (-oo:+oo)
(5/7)*k+8 = 29 // - 29
(5/7)*k-29+8 = 0
5/7*k-21 = 0 // + 21
5/7*k = 21 // : 5/7
k = 21/5/7
k = 147/5
k = 147/5
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