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n in (-oo:+oo)
n/8 = 18/45 // - 18/45
n/8-(18/45) = 0
n/8-2/5 = 0
1/8*n-2/5 = 0 // + 2/5
1/8*n = 2/5 // : 1/8
n = 2/5/1/8
n = 16/5
n = 16/5
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