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(x/3)*x+1/8-6 = 0
1/3*x^2 = 47/8 // : 1/3
x^2 = 141/8
x^2 = 141/8 // ^ 1/2
abs(x) = (141/8)^(1/2)
x = (141/8)^(1/2) or x = -(141/8)^(1/2)
x in { (141/8)^(1/2), -(141/8)^(1/2) }
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