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n in (-oo:+oo)
19/9 = n/12 // - n/12
19/9-(n/12) = 0
19/9-1/12*n = 0 // - 19/9
-1/12*n = -19/9 // : -1/12
n = -19/9/(-1/12)
n = 76/3
n = 76/3
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