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k in (-oo:+oo)
3-(2*k) = 8*k-(3/(-3)) // - 8*k-(3/(-3))
3/(-3)-(2*k)-(8*k)+3 = 0
3/(-3)-2*k-8*k+3 = 0
2-10*k = 0 // - 2
-10*k = -2 // : -10
k = -2/(-10)
k = 1/5
k = 1/5
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