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n in (-oo:+oo)
34/51 = n/12 // - n/12
34/51-(n/12) = 0
2/3-1/12*n = 0 // - 2/3
-1/12*n = -2/3 // : -1/12
n = -2/3/(-1/12)
n = 8
n = 8
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