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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
(2*m+3)/m = 1 // - 1
(2*m+3)/m-1 = 0
(2*m+3)/m+(-1*m)/m = 0
2*m-1*m+3 = 0
m+3 = 0
(m+3)/m = 0
(m+3)/m = 0 // * m
m+3 = 0
m+3 = 0 // - 3
m = -3
m = -3
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