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k in (-oo:+oo)
4/5-(3*k) = 23/10 // - 23/10
4/5-(3*k)-(23/10) = 0
4/5-3*k-23/10 = 0
-3*k-3/2 = 0 // + 3/2
-3*k = 3/2 // : -3
k = 3/2/(-3)
k = -1/2
k = -1/2
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