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n in (-oo:+oo)
15/40 = n/8 // - n/8
15/40-(n/8) = 0
3/8-1/8*n = 0 // - 3/8
-1/8*n = -3/8 // : -1/8
n = -3/8/(-1/8)
n = 3
n = 3
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