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n in (-oo:+oo)
30/100 = n/120 // - n/120
30/100-(n/120) = 0
3/10-1/120*n = 0 // - 3/10
-1/120*n = -3/10 // : -1/120
n = -3/10/(-1/120)
n = 36
n = 36
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