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x in (-oo:+oo)
A = 3.15*(1/2)*x^9 // - 3.15*(1/2)*x^9
A-(3.15*(1/2)*x^9) = 0
A-1.575*x^9 = 0
-1.575*x^9 = -A // : -1.575
x^9 = 0.63492063*A
x^9 = 0.63492063*A // ^ 1/9
x = 0.63492063^(1/9)*A^(1/9)
x = 0.63492063^(1/9)*A^(1/9)
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