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n in (-oo:+oo)
5/50 = n/80 // - n/80
5/50-(n/80) = 0
1/10-1/80*n = 0 // - 1/10
-1/80*n = -1/10 // : -1/80
n = -1/10/(-1/80)
n = 8
n = 8
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