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(5*x^2)/4-60 = 0
5/4*x^2 = 60 // : 5/4
x^2 = 48
x^2 = 48 // ^ 1/2
abs(x) = 4*3^(1/2)
x = 4*3^(1/2) or x = -(4*3^(1/2))
x in { 4*3^(1/2), -(4*3^(1/2)) }
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