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n in (-oo:+oo)
5/6 = 7*n-(9/9) // - 7*n-(9/9)
5/6-(7*n)+9/9 = 0
5/6-7*n+9/9 = 0
11/6-7*n = 0 // - 11/6
-7*n = -11/6 // : -7
n = -11/6/(-7)
n = 11/42
n = 11/42
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