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k in (-oo:+oo)
(4/5)*k = 2/10 // - 2/10
(4/5)*k-(2/10) = 0
(4/5)*k-1/5 = 0
4/5*k-1/5 = 0 // + 1/5
4/5*k = 1/5 // : 4/5
k = 1/5/4/5
k = 1/4
k = 1/4
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