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D( m )
(m-4)*(m+1) = 0
2*m+2 = 0
m-4 = 0
(m-4)*(m+1) = 0
(m-4)*(m+1) = 0
( m+1 )
m+1 = 0 // - 1
m = -1
( m-4 )
m-4 = 0 // + 4
m = 4
2*m+2 = 0
2*m+2 = 0
2*m+2 = 0 // - 2
2*m = -2 // : 2
m = -2/2
m = -1
m-4 = 0
m-4 = 0
m-4 = 0 // + 4
m = 4
m in (-oo:-1) U (-1:4) U (4:+oo)
3/(m-4)-((m+2)/((m-4)*(m+1))) = 1/(2*m+2) // - 1/(2*m+2)
3/(m-4)-((m+2)/((m-4)*(m+1)))-(1/(2*m+2)) = 0
3/(m-4)-((m+2)/((m-4)*(m+1)))-(2*m+2)^-1 = 0
3/(m-4)+(-1*(m+2))/((m-4)*(m+1))-1/(2*m+2) = 0
(3*(2*m+2))/((m-4)*(2*m+2))+(-1*(m+2)*(2*m+2))/((m-4)*(2*m+2))+(-1*(m-4))/((m-4)*(2*m+2)) = 0
3*(2*m+2)-1*(m+2)*(2*m+2)-1*(m-4) = 0
2-2*m^2-m+4 = 0
6-2*m^2-m = 0
6-2*m^2-m = 0
6-2*m^2-m = 0
DELTA = (-1)^2-(-2*4*6)
DELTA = 49
DELTA > 0
m = (49^(1/2)+1)/(-2*2) or m = (1-49^(1/2))/(-2*2)
m = -2 or m = 3/2
(m+2)*(m-3/2) = 0
((m+2)*(m-3/2))/((m-4)*(2*m+2)) = 0
((m+2)*(m-3/2))/((m-4)*(2*m+2)) = 0 // * (m-4)*(2*m+2)
(m+2)*(m-3/2) = 0
( m+2 )
m+2 = 0 // - 2
m = -2
( m-3/2 )
m-3/2 = 0 // + 3/2
m = 3/2
m in { -2, 3/2 }
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