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x in (-oo:+oo)
(2/3)*x^2 = 27/50 // - 27/50
(2/3)*x^2-(27/50) = 0
(2/3)*x^2-27/50 = 0
2/3*x^2 = 27/50 // : 2/3
x^2 = 81/100
x^2 = 81/100 // ^ 1/2
abs(x) = 9/10
x = 9/10 or x = -9/10
x in { 9/10, -9/10 }
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