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n in (-oo:+oo)
9/12 = 39*n // - 39*n
9/12-(39*n) = 0
9/12-39*n = 0
3/4-39*n = 0 // - 3/4
-39*n = -3/4 // : -39
n = -3/4/(-39)
n = 1/52
n = 1/52
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