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k in (-oo:+oo)
0.9 = k/81 // - k/81
0.9-(k/81) = 0
0.9-1/81*k = 0 // - 0.9
-1/81*k = -0.9 // : -1/81
k = -0.9/(-1/81)
k = 72.89999417
k = 72.89999417
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