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k in (-oo:+oo)
-11/13 = k/13 // - k/13
-(k/13)-11/13 = 0
-1/13*k-11/13 = 0 // + 11/13
-1/13*k = 11/13 // : -1/13
k = 11/13/(-1/13)
k = -11
k = -11
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