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n in (-oo:+oo)
9/20 = n/100 // - n/100
9/20-(n/100) = 0
9/20-1/100*n = 0 // - 9/20
-1/100*n = -9/20 // : -1/100
n = -9/20/(-1/100)
n = 45
n = 45
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