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k in (-oo:+oo)
(-2/5)*k+(1/4)*k+4/5 = 17/25 // - 17/25
(-2/5)*k+(1/4)*k+4/5-(17/25) = 0
(-2/5)*k+(1/4)*k+4/5-17/25 = 0
3/25-3/20*k = 0 // - 3/25
-3/20*k = -3/25 // : -3/20
k = -3/25/(-3/20)
k = 4/5
k = 4/5
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