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m in (-oo:+oo)
(2/5)*m^2 = 6/8 // - 6/8
(2/5)*m^2-(6/8) = 0
(2/5)*m^2-3/4 = 0
2/5*m^2 = 3/4 // : 2/5
m^2 = 15/8
m^2 = 15/8 // ^ 1/2
abs(m) = (15/8)^(1/2)
m = (15/8)^(1/2) or m = -(15/8)^(1/2)
m in { (15/8)^(1/2), -(15/8)^(1/2) }
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