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n in (-oo:+oo)
(4*(n+2))/5 = -n // + n
(4*(n+2))/5+n = 0
(4*(n+2))/5+(5*n)/5 = 0
4*(n+2)+5*n = 0
9*n+8 = 0
(9*n+8)/5 = 0
(9*n+8)/5 = 0 // * 5
9*n+8 = 0
9*n+8 = 0 // - 8
9*n = -8 // : 9
n = -8/9
n = -8/9
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