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k in (-oo:+oo)
7/5 = k/18 // - k/18
7/5-(k/18) = 0
7/5-1/18*k = 0 // - 7/5
-1/18*k = -7/5 // : -1/18
k = -7/5/(-1/18)
k = 126/5
k = 126/5
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