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n in (-oo:+oo)
12/16 = n/4 // - n/4
12/16-(n/4) = 0
3/4-1/4*n = 0 // - 3/4
-1/4*n = -3/4 // : -1/4
n = -3/4/(-1/4)
n = 3
n = 3
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