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(7*x^2)/3-252 = 0
7/3*x^2 = 252 // : 7/3
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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