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n in (-oo:+oo)
19/12 = n/13 // - n/13
19/12-(n/13) = 0
19/12-1/13*n = 0 // - 19/12
-1/13*n = -19/12 // : -1/13
n = -19/12/(-1/13)
n = 247/12
n = 247/12
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