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(9/2)*x^2-16 = 0
9/2*x^2 = 16 // : 9/2
x^2 = 32/9
x^2 = 32/9 // ^ 1/2
abs(x) = (32/9)^(1/2)
x = (32/9)^(1/2) or x = -(32/9)^(1/2)
x in { (32/9)^(1/2), -(32/9)^(1/2) }
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