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M in (-oo:+oo)
M/5 = 16/40 // - 16/40
M/5-(16/40) = 0
M/5-2/5 = 0
1/5*M-2/5 = 0 // + 2/5
1/5*M = 2/5 // : 1/5
M = 2/5/1/5
M = 2
M = 2
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