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x in (-oo:+oo)
48-((18/3)*x^2) = 0
48-6*x^2 = 0
-6*x^2 = -48 // : -6
x^2 = 8
x^2 = 8 // ^ 1/2
abs(x) = 2*2^(1/2)
x = 2*2^(1/2) or x = -(2*2^(1/2))
x in { 2*2^(1/2), -(2*2^(1/2)) }
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