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D( m )
m^2-4 = 0
m^2-4 = 0
m^2-4 = 0
1*m^2 = 4 // : 1
m^2 = 4
m^2 = 4 // ^ 1/2
abs(m) = 2
m = 2 or m = -2
m in (-oo:-2) U (-2:2) U (2:+oo)
(5-(6*m))/(m^2-4) = 0
(5-6*m)/(m^2-4) = 0
5-6*m = 0 // - 5
-6*m = -5 // : -6
m = -5/(-6)
m = 5/6
m = 5/6
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