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k in (-oo:+oo)
7/6 = k/26 // - k/26
7/6-(k/26) = 0
7/6-1/26*k = 0 // - 7/6
-1/26*k = -7/6 // : -1/26
k = -7/6/(-1/26)
k = 91/3
k = 91/3
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