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n in (-oo:+oo)
7/13 = n/78 // - n/78
7/13-(n/78) = 0
7/13-1/78*n = 0 // - 7/13
-1/78*n = -7/13 // : -1/78
n = -7/13/(-1/78)
n = 42
n = 42
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