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k in (-oo:+oo)
-7*k-(7/8) = 91/24 // - 91/24
-7*k-(7/8)-(91/24) = 0
-7*k-7/8-91/24 = 0
-7*k-14/3 = 0 // + 14/3
-7*k = 14/3 // : -7
k = 14/3/(-7)
k = -2/3
k = -2/3
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