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k in (-oo:+oo)
-8 = (4/5)*k // - (4/5)*k
-((4/5)*k)-8 = 0
(-4/5)*k-8 = 0
-4/5*k-8 = 0 // + 8
-4/5*k = 8 // : -4/5
k = 8/(-4/5)
k = -10
k = -10
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