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n in (-oo:+oo)
n/48 = 2/8 // - 2/8
n/48-(2/8) = 0
n/48-1/4 = 0
1/48*n-1/4 = 0 // + 1/4
1/48*n = 1/4 // : 1/48
n = 1/4/1/48
n = 12
n = 12
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