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x in (-oo:+oo)
(x^2)/6 = 50/3 // - 50/3
(x^2)/6-(50/3) = 0
(x^2)/6-50/3 = 0
1/6*x^2 = 50/3 // : 1/6
x^2 = 100
x^2 = 100 // ^ 1/2
abs(x) = 10
x = 10 or x = -10
x in { 10, -10 }
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