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n in (-oo:+oo)
8/5 = n/18 // - n/18
8/5-(n/18) = 0
8/5-1/18*n = 0 // - 8/5
-1/18*n = -8/5 // : -1/18
n = -8/5/(-1/18)
n = 144/5
n = 144/5
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