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n in (-oo:+oo)
n/75 = 4/100 // - 4/100
n/75-(4/100) = 0
n/75-1/25 = 0
1/75*n-1/25 = 0 // + 1/25
1/75*n = 1/25 // : 1/75
n = 1/25/1/75
n = 3
n = 3
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