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m in (-oo:+oo)
49*m^2-(16/9) = 0
49*m^2-16/9 = 0
49*m^2 = 16/9 // : 49
m^2 = 16/441
m^2 = 16/441 // ^ 1/2
abs(m) = 4/21
m = 4/21 or m = -4/21
m in { 4/21, -4/21 }
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