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N in (-oo:+oo)
3/8-N = 1/4 // - 1/4
3/8-N-(1/4) = 0
3/8-N-1/4 = 0
1/8-N = 0 // - 1/8
-N = -1/8 // * -1
N = 1/8
N = 1/8
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