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