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m in (-oo:+oo)
(1/4)*m^2-(1/9) = 0
(1/4)*m^2-1/9 = 0
1/4*m^2 = 1/9 // : 1/4
m^2 = 4/9
m^2 = 4/9 // ^ 1/2
abs(m) = 2/3
m = 2/3 or m = -2/3
m in { 2/3, -2/3 }
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