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n in (-oo:+oo)
8/12 = 12*n // - 12*n
8/12-(12*n) = 0
8/12-12*n = 0
2/3-12*n = 0 // - 2/3
-12*n = -2/3 // : -12
n = -2/3/(-12)
n = 1/18
n = 1/18
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