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16*x^2-(1/49) = 0
16*x^2-1/49 = 0
16*x^2 = 1/49 // : 16
x^2 = 1/784
x^2 = 1/784 // ^ 1/2
abs(x) = 1/28
x = 1/28 or x = -1/28
x in { 1/28, -1/28 }
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