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D( m )
60*m = 0
60*m = 0
60*m = 0
60*m = 0 // : 60
m = 0
m in (-oo:0) U (0:+oo)
172/(60*m) = 80 // - 80
172/(60*m)-80 = 0
43/15*m^-1 = 80 // : 43/15
m^-1 = 1200/43
-1 < 0
1/(m^1) = 1200/43 // * m^1
1 = 1200/43*m^1 // : 1200/43
43/1200 = m^1
m = 43/1200
m = 43/1200
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