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D( m )
m^2-16 = 0
m^2-16 = 0
m^2-16 = 0
1*m^2 = 16 // : 1
m^2 = 16
m^2 = 16 // ^ 1/2
abs(m) = 4
m = 4 or m = -4
m in (-oo:-4) U (-4:4) U (4:+oo)
5-((9*m)/(m^2-16)) = 0
5-9*m*(m^2-16)^-1 = 0
(-9*m)/(m^2-16)+5 = 0
(-9*m)/(m^2-16)+(5*(m^2-16))/(m^2-16) = 0
5*(m^2-16)-9*m = 0
5*m^2-9*m-80 = 0
5*m^2-9*m-80 = 0
5*m^2-9*m-80 = 0
DELTA = (-9)^2-(-80*4*5)
DELTA = 1681
DELTA > 0
m = (1681^(1/2)+9)/(2*5) or m = (9-1681^(1/2))/(2*5)
m = 5 or m = -16/5
(m+16/5)*(m-5) = 0
((m+16/5)*(m-5))/(m^2-16) = 0
((m+16/5)*(m-5))/(m^2-16) = 0 // * m^2-16
(m+16/5)*(m-5) = 0
( m+16/5 )
m+16/5 = 0 // - 16/5
m = -16/5
( m-5 )
m-5 = 0 // + 5
m = 5
m in { -16/5, 5 }
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