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n in (-oo:+oo)
n/5 = 8/45 // - 8/45
n/5-(8/45) = 0
n/5-8/45 = 0
1/5*n-8/45 = 0 // + 8/45
1/5*n = 8/45 // : 1/5
n = 8/45/1/5
n = 8/9
n = 8/9
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