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n in (-oo:+oo)
16/12 = n/18 // - n/18
16/12-(n/18) = 0
4/3-1/18*n = 0 // - 4/3
-1/18*n = -4/3 // : -1/18
n = -4/3/(-1/18)
n = 24
n = 24
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