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N in (-oo:+oo)
N/1.4-2.9 = -5.11 // + 5.11
N/1.4-2.9+5.11 = 0
0.71428571*N+2.21 = 0 // - 2.21
0.71428571*N = -2.21 // : 0.71428571
N = -2.21/0.71428571
N = -3.09400002
N = -3.09400002
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