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n in (-oo:+oo)
56/64 = 7*n // - 7*n
56/64-(7*n) = 0
56/64-7*n = 0
7/8-7*n = 0 // - 7/8
-7*n = -7/8 // : -7
n = -7/8/(-7)
n = 1/8
n = 1/8
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