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N in (-oo:+oo)
7/9 = 2*N+1/8 // - 2*N+1/8
7/9-(2*N)-(1/8) = 0
7/9-2*N-1/8 = 0
47/72-2*N = 0 // - 47/72
-2*N = -47/72 // : -2
N = -47/72/(-2)
N = 47/144
N = 47/144
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