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n in (-oo:+oo)
4/9 = n/5 // - n/5
4/9-(n/5) = 0
4/9-1/5*n = 0 // - 4/9
-1/5*n = -4/9 // : -1/5
n = -4/9/(-1/5)
n = 20/9
n = 20/9
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