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