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n in (-oo:+oo)
n/20 = 12/5 // - 12/5
n/20-(12/5) = 0
n/20-12/5 = 0
1/20*n-12/5 = 0 // + 12/5
1/20*n = 12/5 // : 1/20
n = 12/5/1/20
n = 48
n = 48
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