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D( m )
5*m = 0
5*m = 0
5*m = 0
5*m = 0 // : 5
m = 0
m in (-oo:0) U (0:+oo)
2/(5*m)+7/8 = 0
2/5*m^-1 = -7/8 // : 2/5
m^-1 = -35/16
-1 < 0
1/(m^1) = -35/16 // * m^1
1 = -35/16*m^1 // : -35/16
-16/35 = m^1
m = -16/35
m = -16/35
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