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n in (-oo:+oo)
n/5 = 31/40 // - 31/40
n/5-(31/40) = 0
n/5-31/40 = 0
1/5*n-31/40 = 0 // + 31/40
1/5*n = 31/40 // : 1/5
n = 31/40/1/5
n = 31/8
n = 31/8
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