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D( m )
m^2-9 = 0
m^2-9 = 0
m^2-9 = 0
1*m^2 = 9 // : 1
m^2 = 9
m^2 = 9 // ^ 1/2
abs(m) = 3
m = 3 or m = -3
m in (-oo:-3) U (-3:3) U (3:+oo)
(5-(6*m))/(m^2-9) = 0
(5-6*m)/(m^2-9) = 0
5-6*m = 0 // - 5
-6*m = -5 // : -6
m = -5/(-6)
m = 5/6
m = 5/6
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