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N in (-oo:+oo)
N/3 = 12.8 // - 12.8
N/3-12.8 = 0
1/3*N-12.8 = 0 // + 12.8
1/3*N = 12.8 // : 1/3
N = 12.8/1/3
N = 38.40000038
N = 38.40000038
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