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(6*x^2)/3-216 = 0
2*x^2 = 216 // : 2
x^2 = 108
x^2 = 108 // ^ 1/2
abs(x) = 6*3^(1/2)
x = 6*3^(1/2) or x = -(6*3^(1/2))
x in { 6*3^(1/2), -(6*3^(1/2)) }
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