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k in (-oo:+oo)
(4/7)*k+5 = 7 // - 7
(4/7)*k-7+5 = 0
4/7*k-2 = 0 // + 2
4/7*k = 2 // : 4/7
k = 2/4/7
k = 7/2
k = 7/2
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