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n in (-oo:+oo)
3/4 = n/100 // - n/100
3/4-(n/100) = 0
3/4-1/100*n = 0 // - 3/4
-1/100*n = -3/4 // : -1/100
n = -3/4/(-1/100)
n = 75
n = 75
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