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6-((16/2)*x^2) = 0
6-8*x^2 = 0
-8*x^2 = -6 // : -8
x^2 = 3/4
x^2 = 3/4 // ^ 1/2
abs(x) = (3/4)^(1/2)
x = (3/4)^(1/2) or x = -(3/4)^(1/2)
x in { (3/4)^(1/2), -(3/4)^(1/2) }
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