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