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N in (-oo:+oo)
N/1.9 = 5 // - 5
N/1.9-5 = 0
0.52631579*N-5 = 0 // + 5
0.52631579*N = 5 // : 0.52631579
N = 5/0.52631579
N = 9.49999999
N = 9.49999999
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