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n in (-oo:+oo)
n/8 = 7/9 // - 7/9
n/8-(7/9) = 0
n/8-7/9 = 0
1/8*n-7/9 = 0 // + 7/9
1/8*n = 7/9 // : 1/8
n = 7/9/1/8
n = 56/9
n = 56/9
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