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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
-4/28 = 5/m // - 5/m
-(5/m)-4/28 = 0
-5*m^-1-4/28 = 0
-5*m^-1 = 1/7 // : -5
m^-1 = -1/35
-1 < 0
1/(m^1) = -1/35 // * m^1
1 = -1/35*m^1 // : -1/35
-35 = m^1
m = -35
m = -35
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