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(x/2)*x+1/6-4 = 0
1/2*x^2 = 23/6 // : 1/2
x^2 = 23/3
x^2 = 23/3 // ^ 1/2
abs(x) = (23/3)^(1/2)
x = (23/3)^(1/2) or x = -(23/3)^(1/2)
x in { (23/3)^(1/2), -(23/3)^(1/2) }
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