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N in (-oo:+oo)
N/7-2.4 = -4.285 // + 4.285
N/7-2.4+4.285 = 0
1/7*N+1.885 = 0 // - 1.885
1/7*N = -1.885 // : 1/7
N = -1.885/1/7
N = -13.19500026
N = -13.19500026
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