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N in (-oo:+oo)
N/2.5 = 1.8 // - 1.8
N/2.5-1.8 = 0
0.4*N-1.8 = 0 // + 1.8
0.4*N = 1.8 // : 0.4
N = 1.8/0.4
N = 4.5
N = 4.5
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