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n in (-oo:+oo)
5/9 = n/72 // - n/72
5/9-(n/72) = 0
5/9-1/72*n = 0 // - 5/9
-1/72*n = -5/9 // : -1/72
n = -5/9/(-1/72)
n = 40
n = 40
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