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N in (-oo:+oo)
N/2.7 = 6.81481481481 // - 6.81481481481
N/2.7-6.81481481481 = 0
0.37037037*N-6.81481481481 = 0 // + 6.81481481481
0.37037037*N = 6.81481481481 // : 0.37037037
N = 6.81481481481/0.37037037
N = 18.40000002
N = 18.40000002
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