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m in (-oo:+oo)
49*m^2-(36/25) = 0
49*m^2-36/25 = 0
49*m^2 = 36/25 // : 49
m^2 = 36/1225
m^2 = 36/1225 // ^ 1/2
abs(m) = 6/35
m = 6/35 or m = -6/35
m in { 6/35, -6/35 }
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