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n in (-oo:+oo)
(27/9)/4 = n/5 // - n/5
(27/9)/4-(n/5) = 0
3/4-1/5*n = 0 // - 3/4
-1/5*n = -3/4 // : -1/5
n = -3/4/(-1/5)
n = 15/4
n = 15/4
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