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(16/25)*x^2-1 = 0
16/25*x^2 = 1 // : 16/25
x^2 = 25/16
x^2 = 25/16 // ^ 1/2
abs(x) = 5/4
x = 5/4 or x = -5/4
x in { 5/4, -5/4 }
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