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n in (-oo:+oo)
4/28 = n/77 // - n/77
4/28-(n/77) = 0
1/7-1/77*n = 0 // - 1/7
-1/77*n = -1/7 // : -1/77
n = -1/7/(-1/77)
n = 11
n = 11
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