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D( m )
m+4 = 0
m = 0
m^2+4*m = 0
m+4 = 0
m+4 = 0
m+4 = 0 // - 4
m = -4
m = 0
m = 0
m^2+4*m = 0
m^2+4*m = 0
m^2+4*m = 0
DELTA = 4^2-(0*1*4)
DELTA = 16
DELTA > 0
m = (16^(1/2)-4)/(1*2) or m = (-16^(1/2)-4)/(1*2)
m = 0 or m = -4
m in (-oo:-4) U (-4:0) U (0:+oo)
4/(m+4)+5/m = (3*m+4)/(m^2+4*m) // - (3*m+4)/(m^2+4*m)
4/(m+4)-((3*m+4)/(m^2+4*m))+5/m = 0
4/(m+4)+(-1*(3*m+4))/(m^2+4*m)+5/m = 0
m^2+4*m = 0
m^2+4*m = 0
m*(m+4) = 0
m+4 = 0 // - 4
m = -4
m*(m+4) = 0
4/(m+4)+(-1*(3*m+4))/(m*(m+4))+5/m = 0
(4*m)/(m*(m+4))+(-1*(3*m+4))/(m*(m+4))+(5*(m+4))/(m*(m+4)) = 0
5*(m+4)-1*(3*m+4)+4*m = 0
m+5*m-4+20 = 0
6*m+16 = 0
(6*m+16)/(m*(m+4)) = 0
(6*m+16)/(m*(m+4)) = 0 // * m*(m+4)
6*m+16 = 0
6*m+16 = 0 // - 16
6*m = -16 // : 6
m = -16/6
m = -8/3
m = -8/3
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