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k in (-oo:+oo)
(4/5)*k = 4/5 // - 4/5
(4/5)*k-(4/5) = 0
(4/5)*k-4/5 = 0
4/5*k-4/5 = 0 // + 4/5
4/5*k = 4/5 // : 4/5
k = 4/5/4/5
k = 1
k = 1
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