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k in (-oo:+oo)
(-1/5)*k = 1+11 // - 1+11
(-1/5)*k-11-1 = 0
-1/5*k-12 = 0 // + 12
-1/5*k = 12 // : -1/5
k = 12/(-1/5)
k = -60
k = -60
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