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x in (-oo:+oo)
(56.85/pi)*x^2 = 310/360 // - 310/360
(56.85/pi)*x^2-(310/360) = 0
(56.85/pi)*x^2-31/36 = 0
(56.85/pi)*x^2 = 31/36 // : 56.85/pi
x^2 = 0.01514707*pi
x^2 = 0.01514707*pi // ^ 1/2
abs(x) = 0.01514707^(1/2)*pi^(1/2)
x = 0.01514707^(1/2)*pi^(1/2) or x = -(0.01514707^(1/2)*pi^(1/2))
x in { 0.01514707^(1/2)*pi^(1/2), -(0.01514707^(1/2)*pi^(1/2)) }
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