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