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