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k in (-oo:+oo)
-k/5 = 18/10 // - 18/10
-k/5-(18/10) = 0
-k/5-9/5 = 0
-1/5*k-9/5 = 0 // + 9/5
-1/5*k = 9/5 // : -1/5
k = 9/5/(-1/5)
k = -9
k = -9
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