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m in (-oo:+oo)
(2*m^2)/5 = 10 // - 10
(2*m^2)/5-10 = 0
2/5*m^2 = 10 // : 2/5
m^2 = 25
m^2 = 25 // ^ 1/2
abs(m) = 5
m = 5 or m = -5
m in { 5, -5 }
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