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n in (-oo:+oo)
3/12 = n/8 // - n/8
3/12-(n/8) = 0
1/4-1/8*n = 0 // - 1/4
-1/8*n = -1/4 // : -1/8
n = -1/4/(-1/8)
n = 2
n = 2
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