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n in (-oo:+oo)
2/6 = n/12 // - n/12
2/6-(n/12) = 0
1/3-1/12*n = 0 // - 1/3
-1/12*n = -1/3 // : -1/12
n = -1/3/(-1/12)
n = 4
n = 4
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