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n in (-oo:+oo)
12/72 = n/24 // - n/24
12/72-(n/24) = 0
1/6-1/24*n = 0 // - 1/6
-1/24*n = -1/6 // : -1/24
n = -1/6/(-1/24)
n = 4
n = 4
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