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n in (-oo:+oo)
(2/3)*(n+1) = -0.5 // + 0.5
(2/3)*(n+1)+0.5 = 0
2/3*(n+1)+0.5 = 0
2/3*(n+1)+0.5 = 0
2/3*n+1.16666667 = 0
2/3*n+1.16666667 = 0
2/3*n+1.16666667 = 0 // - 1.16666667
2/3*n = -1.16666667 // : 2/3
n = -1.16666667/2/3
n = -1.75
n = -1.75
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