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x in (-oo:+oo)
((4*x)/3)*x = 9/16 // - 9/16
((4*x)/3)*x-(9/16) = 0
((4*x)/3)*x-9/16 = 0
4/3*x^2 = 9/16 // : 4/3
x^2 = 27/64
x^2 = 27/64 // ^ 1/2
abs(x) = (27/64)^(1/2)
x = (27/64)^(1/2) or x = -(27/64)^(1/2)
x in { (27/64)^(1/2), -(27/64)^(1/2) }
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