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k in (-oo:+oo)
2.5/9.2 = k/18 // - k/18
2.5/9.2-(k/18) = 0
0.27173913-1/18*k = 0 // - 0.27173913
-1/18*k = -0.27173913 // : -1/18
k = -0.27173913/(-1/18)
k = 4.89130395
k = 4.89130395
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