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