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n in (-oo:+oo)
5/9 = n/15 // - n/15
5/9-(n/15) = 0
5/9-1/15*n = 0 // - 5/9
-1/15*n = -5/9 // : -1/15
n = -5/9/(-1/15)
n = 25/3
n = 25/3
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