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n in (-oo:+oo)
12/18 = n/27 // - n/27
12/18-(n/27) = 0
2/3-1/27*n = 0 // - 2/3
-1/27*n = -2/3 // : -1/27
n = -2/3/(-1/27)
n = 18
n = 18
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