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n in (-oo:+oo)
5/6 = n/18 // - n/18
5/6-(n/18) = 0
5/6-1/18*n = 0 // - 5/6
-1/18*n = -5/6 // : -1/18
n = -5/6/(-1/18)
n = 15
n = 15
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