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x in (-oo:+oo)
17 = (x^2)/3 // - (x^2)/3
17-((x^2)/3) = 0
-1/3*x^2 = -17 // : -1/3
x^2 = 51
x^2 = 51 // ^ 1/2
abs(x) = 51^(1/2)
x = 51^(1/2) or x = -51^(1/2)
x in { 51^(1/2), -51^(1/2) }
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