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m in (-oo:+oo)
4/9-(16*m^2) = 0
4/9-16*m^2 = 0
-16*m^2 = -4/9 // : -16
m^2 = 1/36
m^2 = 1/36 // ^ 1/2
abs(m) = 1/6
m = 1/6 or m = -1/6
m in { 1/6, -1/6 }
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