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N in (-oo:+oo)
7/9 = N+1/9 // - N+1/9
7/9-N-(1/9) = 0
7/9-N-1/9 = 0
2/3-N = 0 // - 2/3
-N = -2/3 // * -1
N = 2/3
N = 2/3
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