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4/5-(((1/4)*x^2)/3) = 0
(-1/12)*x^2+4/5 = 0
-1/12*x^2 = -4/5 // : -1/12
x^2 = 48/5
x^2 = 48/5 // ^ 1/2
abs(x) = (48/5)^(1/2)
x = (48/5)^(1/2) or x = -(48/5)^(1/2)
x in { (48/5)^(1/2), -(48/5)^(1/2) }
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