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k in (-oo:+oo)
(3/5)*k+5 = 7 // - 7
(3/5)*k-7+5 = 0
3/5*k-2 = 0 // + 2
3/5*k = 2 // : 3/5
k = 2/3/5
k = 10/3
k = 10/3
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