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a in (-oo:+oo)
64*a^2-(9/16) = 0
64*a^2-9/16 = 0
64*a^2 = 9/16 // : 64
a^2 = 9/1024
a^2 = 9/1024 // ^ 1/2
abs(a) = 3/32
a = 3/32 or a = -3/32
a in { 3/32, -3/32 }
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