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k in (-oo:+oo)
10/9 = k/10 // - k/10
10/9-(k/10) = 0
10/9-1/10*k = 0 // - 10/9
-1/10*k = -10/9 // : -1/10
k = -10/9/(-1/10)
k = 100/9
k = 100/9
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