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D( m )
m^2 = 0
m^2 = 0
m^2 = 0
1*m^2 = 0 // : 1
m^2 = 0
m = 0
m in (-oo:0) U (0:+oo)
7-((3*m)/(m^2))-4 = 0
7-3*m^-1-4 = 0
-3*m^-1 = -3 // : -3
m^-1 = 1
-1 < 0
1/(m^1) = 1 // * m^1
1 = 1*m^1 // : 1
1 = m^1
m = 1
m = 1
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