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n in (-oo:+oo)
5/6 = n/9 // - n/9
5/6-(n/9) = 0
5/6-1/9*n = 0 // - 5/6
-1/9*n = -5/6 // : -1/9
n = -5/6/(-1/9)
n = 15/2
n = 15/2
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