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m in (-oo:+oo)
25*m^2-(16/19) = 0
25*m^2-16/19 = 0
25*m^2 = 16/19 // : 25
m^2 = 16/475
m^2 = 16/475 // ^ 1/2
abs(m) = (16/475)^(1/2)
m = (16/475)^(1/2) or m = -(16/475)^(1/2)
m in { (16/475)^(1/2), -(16/475)^(1/2) }
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