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