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((4*x)/5)*x-25 = 0
4/5*x^2 = 25 // : 4/5
x^2 = 125/4
x^2 = 125/4 // ^ 1/2
abs(x) = (125/4)^(1/2)
x = (125/4)^(1/2) or x = -(125/4)^(1/2)
x in { (125/4)^(1/2), -(125/4)^(1/2) }
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