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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3/m+2/3 = 31/15 // - 31/15
3/m+2/3-(31/15) = 0
3/m+2/3-31/15 = 0
3*m^-1 = 7/5 // : 3
m^-1 = 7/15
-1 < 0
1/(m^1) = 7/15 // * m^1
1 = 7/15*m^1 // : 7/15
15/7 = m^1
m = 15/7
m = 15/7
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