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k in (-oo:+oo)
-6 = k/13+22 // - k/13+22
-(k/13)-22-6 = 0
-1/13*k-28 = 0 // + 28
-1/13*k = 28 // : -1/13
k = 28/(-1/13)
k = -364
k = -364
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