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