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n in (-oo:+oo)
12/18 = n/38 // - n/38
12/18-(n/38) = 0
2/3-1/38*n = 0 // - 2/3
-1/38*n = -2/3 // : -1/38
n = -2/3/(-1/38)
n = 76/3
n = 76/3
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