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