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k in (-oo:+oo)
(1/3)*k-k-(1/3) = (1/9)*(k+1) // - (1/9)*(k+1)
(1/3)*k-((1/9)*(k+1))-k-(1/3) = 0
(-1/9)*(k+1)+(1/3)*k-k-1/3 = 0
k/3-1/9*(k+1)-k-1/3 = 0
(-1/9*3*(k+1))/3+k/3+(3*(-k))/3-1/3 = 0
k-1/9*3*(k+1)+3*(-k)-1 = 0
2/3*k-3*k-1-1/3 = 0
-7/3*k-1-1/3 = 0
-7/3*k-4/3 = 0
(-7/3*k-4/3)/3 = 0
(-7/3*k-4/3)/3 = 0 // * 3
-7/3*k-4/3 = 0
-7/3*k-4/3 = 0 // + 4/3
-7/3*k = 4/3 // : -7/3
k = 4/3/(-7/3)
k = -4/7
k = -4/7
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