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n in (-oo:+oo)
9/100 = n/50 // - n/50
9/100-(n/50) = 0
9/100-1/50*n = 0 // - 9/100
-1/50*n = -9/100 // : -1/50
n = -9/100/(-1/50)
n = 9/2
n = 9/2
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