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D( m )
1-(3*m) = 0
1-(3*m) = 0
1-(3*m) = 0
1-3*m = 0
1-3*m = 0 // - 1
-3*m = -1 // : -3
m = -1/(-3)
m = 1/3
m in (-oo:1/3) U (1/3:+oo)
(2*m)/(1-(3*m))+5/8 = 0
(2*m)/(1-3*m)+5/8 = 0
(2*8*m)/(8*(1-3*m))+(5*(1-3*m))/(8*(1-3*m)) = 0
5*(1-3*m)+2*8*m = 0
m+5 = 0
(m+5)/(8*(1-3*m)) = 0
(m+5)/(8*(1-3*m)) = 0 // * 8*(1-3*m)
m+5 = 0
m+5 = 0 // - 5
m = -5
m = -5
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