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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
9/m+2.19 = 4.7 // - 4.7
9/m-4.7+2.19 = 0
9*m^-1 = 2.51 // : 9
m^-1 = 0.27888889
-1 < 0
1/(m^1) = 0.27888889 // * m^1
1 = 0.27888889*m^1 // : 0.27888889
3.58565736 = m^1
m = 3.58565736
m = 3.58565736
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