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