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