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n in (-oo:+oo)
3/200 = n/100 // - n/100
3/200-(n/100) = 0
3/200-1/100*n = 0 // - 3/200
-1/100*n = -3/200 // : -1/100
n = -3/200/(-1/100)
n = 3/2
n = 3/2
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