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n in (-oo:+oo)
5/15 = n/27 // - n/27
5/15-(n/27) = 0
1/3-1/27*n = 0 // - 1/3
-1/27*n = -1/3 // : -1/27
n = -1/3/(-1/27)
n = 9
n = 9
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