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n in (-oo:+oo)
8/10 = n/15 // - n/15
8/10-(n/15) = 0
4/5-1/15*n = 0 // - 4/5
-1/15*n = -4/5 // : -1/15
n = -4/5/(-1/15)
n = 12
n = 12
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