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a in (-oo:+oo)
4*a^2-(9/64) = 0
4*a^2-9/64 = 0
4*a^2 = 9/64 // : 4
a^2 = 9/256
a^2 = 9/256 // ^ 1/2
abs(a) = 3/16
a = 3/16 or a = -3/16
a in { 3/16, -3/16 }
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