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n in (-oo:+oo)
n/0.4 = 0.02/5 // - 0.02/5
n/0.4-(0.02/5) = 0
n/0.4-0.004 = 0
2.5*n-0.004 = 0 // + 0.004
2.5*n = 0.004 // : 2.5
n = 0.004/2.5
n = 0.0016
n = 0.0016
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