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