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