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n in (-oo:+oo)
n/(-3.88) = -2000 // + 2000
n/(-3.88)+2000 = 0
2000-0.25773196*n = 0 // - 2000
-0.25773196*n = -2000 // : -0.25773196
n = -2000/(-0.25773196)
n = 7759.99996275
n = 7759.99996275
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