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x in (-oo:+oo)
0.0015986 = 4*(pi/4)*x^2*z // - 4*(pi/4)*x^2*z
0.0015986-(4*(pi/4)*x^2*z) = 0
0.0015986-(pi*x^2*z) = 0
-pi*x^2*z = -0.0015986 // : -pi*z
x^2 = 0.0015986/(pi*z)
x^2 = 0.0015986/(pi*z) // ^ 1/2
abs(x) = (0.0015986^(1/2))/(pi^(1/2)*z^(1/2))
x = (0.0015986^(1/2))/(pi^(1/2)*z^(1/2)) or x = -((0.0015986^(1/2))/(pi^(1/2)*z^(1/2)))
x in { (0.0015986^(1/2))/(pi^(1/2)*z^(1/2)), -((0.0015986^(1/2))/(pi^(1/2)*z^(1/2))) }
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