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