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x in (-oo:+oo)
x^2-(4/25) = 0
x^2-4/25 = 0
1*x^2 = 4/25 // : 1
x^2 = 4/25
x^2 = 4/25 // ^ 1/2
abs(x) = 2/5
x = 2/5 or x = -2/5
x in { 2/5, -2/5 }
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