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m in (-oo:+oo)
5*m^2-(4/9) = 0
5*m^2-4/9 = 0
5*m^2 = 4/9 // : 5
m^2 = 4/45
m^2 = 4/45 // ^ 1/2
abs(m) = (4/45)^(1/2)
m = (4/45)^(1/2) or m = -(4/45)^(1/2)
m in { (4/45)^(1/2), -(4/45)^(1/2) }
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