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4*x^2-(1/25) = 0
4*x^2-1/25 = 0
4*x^2 = 1/25 // : 4
x^2 = 1/100
x^2 = 1/100 // ^ 1/2
abs(x) = 1/10
x = 1/10 or x = -1/10
x in { 1/10, -1/10 }
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