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n in (-oo:+oo)
30/18 = n/3 // - n/3
30/18-(n/3) = 0
5/3-1/3*n = 0 // - 5/3
-1/3*n = -5/3 // : -1/3
n = -5/3/(-1/3)
n = 5
n = 5
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