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M in (-oo:+oo)
60*M = 9/60 // - 9/60
60*M-(9/60) = 0
60*M-3/20 = 0
60*M-3/20 = 0 // + 3/20
60*M = 3/20 // : 60
M = 3/20/60
M = 1/400
M = 1/400
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