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(6*x^2)/40-40 = 0
3/20*x^2 = 40 // : 3/20
x^2 = 800/3
x^2 = 800/3 // ^ 1/2
abs(x) = (800/3)^(1/2)
x = (800/3)^(1/2) or x = -(800/3)^(1/2)
x in { (800/3)^(1/2), -(800/3)^(1/2) }
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