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x in (-oo:+oo)
3-(((2*x)/3)*x) < 0
(-2/3)*x^2+3 < 0
-2/3*x^2 < -3
-2/3*x^2 < -3 // * -1
2/3*x^2 > 3
2/3*x^2 > 3 // : 2/3
x^2 > 3/2/3
x^2 > 9/2
x^2 > 9/2 // ^ 1/2
abs(x) > (9/2)^(1/2)
x in (-oo:-(9/2)^(1/2)) U ((9/2)^(1/2):+oo)
x in (-oo:-(9/2)^(1/2)) U ((9/2)^(1/2):+oo)
(-oo:-(9/2)^(1/2)) U ((9/2)^(1/2):+oo)
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