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n in (-oo:+oo)
n/(-2) = -2/5 // + -2/5
n/(-2)-(-2/5) = 0
n/(-2)+2/5 = 0
2/5-1/2*n = 0 // - 2/5
-1/2*n = -2/5 // : -1/2
n = -2/5/(-1/2)
n = 4/5
n = 4/5
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