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N in (-oo:+oo)
N/5 = -0.3 // + 0.3
N/5+0.3 = 0
1/5*N+0.3 = 0 // - 0.3
1/5*N = -0.3 // : 1/5
N = -0.3/1/5
N = -1.5
N = -1.5
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