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n in (-oo:+oo)
-24/5 = (-31/2)*n // - (-31/2)*n
-((-31/2)*n)-24/5 = 0
(31/2)*n-24/5 = 0
31/2*n-24/5 = 0 // + 24/5
31/2*n = 24/5 // : 31/2
n = 24/5/31/2
n = 48/155
n = 48/155
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