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x in (-oo:+oo)
100 = (x^2)/3 // - (x^2)/3
100-((x^2)/3) = 0
-1/3*x^2 = -100 // : -1/3
x^2 = 300
x^2 = 300 // ^ 1/2
abs(x) = 10*3^(1/2)
x = 10*3^(1/2) or x = -(10*3^(1/2))
x in { 10*3^(1/2), -(10*3^(1/2)) }
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