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k in (-oo:+oo)
2/3-k = 6/5-(k/3) // - 6/5-(k/3)
k/3-k+2/3-(6/5) = 0
k/3-k+2/3-6/5 = 0
-2/3*k-8/15 = 0 // + 8/15
-2/3*k = 8/15 // : -2/3
k = 8/15/(-2/3)
k = -4/5
k = -4/5
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