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n in (-oo:+oo)
15/27 = n/45 // - n/45
15/27-(n/45) = 0
5/9-1/45*n = 0 // - 5/9
-1/45*n = -5/9 // : -1/45
n = -5/9/(-1/45)
n = 25
n = 25
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