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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
10/m = -4 // + 4
10/m+4 = 0
10*m^-1 = -4 // : 10
m^-1 = -2/5
-1 < 0
1/(m^1) = -2/5 // * m^1
1 = -2/5*m^1 // : -2/5
-5/2 = m^1
m = -5/2
m = -5/2
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