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k in (-oo:+oo)
1/2-((1/3)*k) = 1/5 // - 1/5
1/2-((1/3)*k)-(1/5) = 0
(-1/3)*k+1/2-1/5 = 0
3/10-1/3*k = 0 // - 3/10
-1/3*k = -3/10 // : -1/3
k = -3/10/(-1/3)
k = 9/10
k = 9/10
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