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n in (-oo:+oo)
n/9 = 8/9 // - 8/9
n/9-(8/9) = 0
n/9-8/9 = 0
1/9*n-8/9 = 0 // + 8/9
1/9*n = 8/9 // : 1/9
n = 8/9/1/9
n = 8
n = 8
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