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N in (-oo:+oo)
N/100 = 25/20 // - 25/20
N/100-(25/20) = 0
N/100-5/4 = 0
1/100*N-5/4 = 0 // + 5/4
1/100*N = 5/4 // : 1/100
N = 5/4/1/100
N = 125
N = 125
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