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n in (-oo:+oo)
6/100 = n/50 // - n/50
6/100-(n/50) = 0
3/50-1/50*n = 0 // - 3/50
-1/50*n = -3/50 // : -1/50
n = -3/50/(-1/50)
n = 3
n = 3
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