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m in (-oo:+oo)
25*m^2-(16/49) = 0
25*m^2-16/49 = 0
25*m^2 = 16/49 // : 25
m^2 = 16/1225
m^2 = 16/1225 // ^ 1/2
abs(m) = 4/35
m = 4/35 or m = -4/35
m in { 4/35, -4/35 }
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