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D( m )
m+4 = 0
m+4 = 0
m+4 = 0
m+4 = 0 // - 4
m = -4
m in (-oo:-4) U (-4:+oo)
(3*m)/(m+4)-((5*m)/3) = 0
(3*m)/(m+4)+(-5/3)*m = 0
(3*m)/(m+4)+(-5*m)/3 = 0
(3*3*m)/(3*(m+4))+(-5*m*(m+4))/(3*(m+4)) = 0
3*3*m-5*m*(m+4) = 0
-5*m^2-11*m = 0
-5*m^2-11*m = 0
-m*(5*m+11) = 0
5*m+11 = 0 // - 11
5*m = -11 // : 5
m = -11/5
-m*(m+11/5) = 0
(-m*(m+11/5))/(3*(m+4)) = 0
(-m*(m+11/5))/(3*(m+4)) = 0 // * 3*(m+4)
-m*(m+11/5) = 0
( -m )
-1*m = 0 // : -1
m = 0
( m+11/5 )
m+11/5 = 0 // - 11/5
m = -11/5
m in { 0, -11/5 }
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