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n in (-oo:+oo)
16/18 = n/3 // - n/3
16/18-(n/3) = 0
8/9-1/3*n = 0 // - 8/9
-1/3*n = -8/9 // : -1/3
n = -8/9/(-1/3)
n = 8/3
n = 8/3
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