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n in (-oo:+oo)
8/50 = n/425 // - n/425
8/50-(n/425) = 0
4/25-1/425*n = 0 // - 4/25
-1/425*n = -4/25 // : -1/425
n = -4/25/(-1/425)
n = 68
n = 68
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