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