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n in (-oo:+oo)
(2/3)*(n+1) = -0.5*n // + -0.5*n
(2/3)*(n+1)-(-0.5*n) = 0
(2/3)*(n+1)+0.5*n = 0
2/3*(n+1)+0.5*n = 0
2/3*(n+1)+0.5*n = 0
1.16666667*n+2/3 = 0
1.16666667*n+2/3 = 0
1.16666667*n+2/3 = 0 // - 2/3
1.16666667*n = -2/3 // : 1.16666667
n = -2/3/1.16666667
n = -0.57142857
n = -0.57142857
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