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x in (-oo:+oo)
((-2*x)/(-3))*x = 4 // - 4
((-2*x)/(-3))*x-4 = 0
2/3*x^2 = 4 // : 2/3
x^2 = 6
x^2 = 6 // ^ 1/2
abs(x) = 6^(1/2)
x = 6^(1/2) or x = -6^(1/2)
x in { 6^(1/2), -6^(1/2) }
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