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