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n in (-oo:+oo)
(1*n)/5+4 = 1*n // - 1*n
(1*n)/5-(1*n)+4 = 0
n/5-n+4 = 0
4-4/5*n = 0 // - 4
-4/5*n = -4 // : -4/5
n = -4/(-4/5)
n = 5
n = 5
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