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n in (-oo:+oo)
5/12 = n/9 // - n/9
5/12-(n/9) = 0
5/12-1/9*n = 0 // - 5/12
-1/9*n = -5/12 // : -1/9
n = -5/12/(-1/9)
n = 15/4
n = 15/4
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