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k in (-oo:+oo)
(4/5)*k-4/5 = 32/5 // - 32/5
(4/5)*k-4/5-(32/5) = 0
(4/5)*k-4/5-32/5 = 0
4/5*k-36/5 = 0 // + 36/5
4/5*k = 36/5 // : 4/5
k = 36/5/4/5
k = 9
k = 9
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