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