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(x/3)*x+1/4-5 = 0
1/3*x^2 = 19/4 // : 1/3
x^2 = 57/4
x^2 = 57/4 // ^ 1/2
abs(x) = (57/4)^(1/2)
x = (57/4)^(1/2) or x = -(57/4)^(1/2)
x in { (57/4)^(1/2), -(57/4)^(1/2) }
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