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k in (-oo:+oo)
(-2/5)*k+4/5 = 4-((4/3)*k) // - 4-((4/3)*k)
(-2/5)*k+(4/3)*k+4/5-4 = 0
14/15*k-16/5 = 0 // + 16/5
14/15*k = 16/5 // : 14/15
k = 16/5/14/15
k = 24/7
k = 24/7
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