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n in (-oo:+oo)
4/5 = n/100 // - n/100
4/5-(n/100) = 0
4/5-1/100*n = 0 // - 4/5
-1/100*n = -4/5 // : -1/100
n = -4/5/(-1/100)
n = 80
n = 80
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