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k in (-oo:+oo)
(-1/3)*(1-(9*k)) = 2/3-k // - 2/3-k
(-1/3)*(1-(9*k))+k-(2/3) = 0
(-1/3)*(1-9*k)+k-2/3 = 0
k-1/3*(1-9*k)-2/3 = 0
(-1/3*3*(1-9*k))/3+(3*k)/3-2/3 = 0
3*k-1/3*3*(1-9*k)-2 = 0
12*k-2-1 = 0
12*k-3 = 0
(12*k-3)/3 = 0
(12*k-3)/3 = 0 // * 3
12*k-3 = 0
12*k-3 = 0 // + 3
12*k = 3 // : 12
k = 3/12
k = 1/4
k = 1/4
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