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n in (-oo:+oo)
n/47 = 31/47 // - 31/47
n/47-(31/47) = 0
n/47-31/47 = 0
1/47*n-31/47 = 0 // + 31/47
1/47*n = 31/47 // : 1/47
n = 31/47/1/47
n = 31
n = 31
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