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x in (-oo:+oo)
A = 17*(1/2)*x^2 // - 17*(1/2)*x^2
A-(17*(1/2)*x^2) = 0
A+(-17/2)*x^2 = 0
-17/2*x^2 = -A // : -17/2
x^2 = 2/17*A
x^2 = 2/17*A // ^ 1/2
abs(x) = (2/17)^(1/2)*A^(1/2)
x = (2/17)^(1/2)*A^(1/2) or x = -((2/17)^(1/2)*A^(1/2))
x in { (2/17)^(1/2)*A^(1/2), -((2/17)^(1/2)*A^(1/2)) }
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