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n in (-oo:+oo)
16/10 = n/45 // - n/45
16/10-(n/45) = 0
8/5-1/45*n = 0 // - 8/5
-1/45*n = -8/5 // : -1/45
n = -8/5/(-1/45)
n = 72
n = 72
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