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(x/2)*x+1/7-8 = 0
1/2*x^2 = 55/7 // : 1/2
x^2 = 110/7
x^2 = 110/7 // ^ 1/2
abs(x) = (110/7)^(1/2)
x = (110/7)^(1/2) or x = -(110/7)^(1/2)
x in { (110/7)^(1/2), -(110/7)^(1/2) }
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