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n in (-oo:+oo)
(-1/3)*(n+8)+(1/3)*n = 1-n // - 1-n
(-1/3)*(n+8)+(1/3)*n+n-1 = 0
n/3-1/3*(n+8)+n-1 = 0
(-1/3*3*(n+8))/3+n/3+(3*n)/3+(-1*3)/3 = 0
n-1/3*3*(n+8)+3*n-1*3 = 0
3*n-8-3 = 0
3*n-11 = 0
(3*n-11)/3 = 0
(3*n-11)/3 = 0 // * 3
3*n-11 = 0
3*n-11 = 0 // + 11
3*n = 11 // : 3
n = 11/3
n = 11/3
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