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k in (-oo:+oo)
3 = (4/5)*k // - (4/5)*k
3-((4/5)*k) = 0
(-4/5)*k+3 = 0
3-4/5*k = 0 // - 3
-4/5*k = -3 // : -4/5
k = -3/(-4/5)
k = 15/4
k = 15/4
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