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x in (-oo:+oo)
d*(d/2)^2*x^2 = 10 // - 10
d*(d/2)^2*x^2-10 = 0
1/4*d^3*x^2 = 10 // : 1/4*d^3
x^2 = 40*d^-3
x^2 = 40*d^-3 // ^ 1/2
abs(x) = 2*10^(1/2)*d^(-3/2)
x = 2*10^(1/2)*d^(-3/2) or x = -(2*10^(1/2)*d^(-3/2))
x in { 2*10^(1/2)*d^(-3/2), -(2*10^(1/2)*d^(-3/2)) }
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