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k in (-oo:+oo)
(6/5)*k-(2*k)+(2/5)*k+9/5+2/5-5 = 0
(6/5)*k-2*k+(2/5)*k+9/5+2/5-5 = 0
-2/5*k-14/5 = 0 // + 14/5
-2/5*k = 14/5 // : -2/5
k = 14/5/(-2/5)
k = -7
k = -7
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