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x in (-oo:+oo)
0.5 = (x^2)/45 // - (x^2)/45
0.5-((x^2)/45) = 0
-1/45*x^2 = -0.5 // : -1/45
x^2 = 22.50000225
x^2 = 22.50000225 // ^ 1/2
abs(x) = 22.50000225^(1/2)
x = 22.50000225^(1/2) or x = -22.50000225^(1/2)
x in { 22.50000225^(1/2), -22.50000225^(1/2) }
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