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x in (-oo:+oo)
(x^2)/3.25 = 13 // - 13
(x^2)/3.25-13 = 0
0.30769231*x^2 = 13 // : 0.30769231
x^2 = 42.24999968
x^2 = 42.24999968 // ^ 1/2
abs(x) = 42.24999968^(1/2)
x = 42.24999968^(1/2) or x = -42.24999968^(1/2)
x in { 42.24999968^(1/2), -42.24999968^(1/2) }
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