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n in (-oo:+oo)
12/18 = n/9 // - n/9
12/18-(n/9) = 0
2/3-1/9*n = 0 // - 2/3
-1/9*n = -2/3 // : -1/9
n = -2/3/(-1/9)
n = 6
n = 6
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