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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
18/m = 7.2 // - 7.2
18/m-7.2 = 0
18*m^-1 = 7.2 // : 18
m^-1 = 0.4
-1 < 0
1/(m^1) = 0.4 // * m^1
1 = 0.4*m^1 // : 0.4
2.5 = m^1
m = 2.5
m = 2.5
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