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m in (-oo:+oo)
m^2*((4*m^3+4*m^2+16*m)/4) = 0
(m^2*(4*m^3+4*m^2+16*m))/4 = 0
4*m^3+4*m^2+16*m = 0
4*m*(m^2+m+4) = 0
m^2+m+4 = 0
DELTA = 1^2-(1*4*4)
DELTA = -15
DELTA < 0
4*m = 0
(4*m*m^2)/4 = 0
( 4*m )
4*m = 0 // : 4
m = 0
( m^2 )
1*m^2 = 0 // : 1
m^2 = 0
m = 0
m in { 0, 0 }
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