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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/10.5 = 10/m // - 10/m
3/10.5-(10/m) = 0
3/10.5-10*m^-1 = 0
-10*m^-1 = -0.28571429 // : -10
m^-1 = 0.02857143
-1 < 0
1/(m^1) = 0.02857143 // * m^1
1 = 0.02857143*m^1 // : 0.02857143
34.99999825 = m^1
m = 34.99999825
m = 34.99999825
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