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7/12-(((4*x)/3)*x) = 0
(-4/3)*x^2+7/12 = 0
-4/3*x^2 = -7/12 // : -4/3
x^2 = 7/16
x^2 = 7/16 // ^ 1/2
abs(x) = (7/16)^(1/2)
x = (7/16)^(1/2) or x = -(7/16)^(1/2)
x in { (7/16)^(1/2), -(7/16)^(1/2) }
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