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n in (-oo:+oo)
n/16 = 1600/40 // - 1600/40
n/16-(1600/40) = 0
n/16-40 = 0
1/16*n-40 = 0 // + 40
1/16*n = 40 // : 1/16
n = 40/1/16
n = 640
n = 640
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