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k in (-oo:+oo)
10-(7*k) = 25/6 // - 25/6
10-(7*k)-(25/6) = 0
10-7*k-25/6 = 0
35/6-7*k = 0 // - 35/6
-7*k = -35/6 // : -7
k = -35/6/(-7)
k = 5/6
k = 5/6
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