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16*x^2-(1/4) = 0
16*x^2-1/4 = 0
16*x^2 = 1/4 // : 16
x^2 = 1/64
x^2 = 1/64 // ^ 1/2
abs(x) = 1/8
x = 1/8 or x = -1/8
x in { 1/8, -1/8 }
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