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x in (-oo:+oo)
1/2 = ((3*x)/5)*x-8 // - ((3*x)/5)*x-8
1/2-(((3*x)/5)*x)+8 = 0
(-3/5)*x^2+1/2+8 = 0
-3/5*x^2 = -17/2 // : -3/5
x^2 = 85/6
x^2 = 85/6 // ^ 1/2
abs(x) = (85/6)^(1/2)
x = (85/6)^(1/2) or x = -(85/6)^(1/2)
x in { (85/6)^(1/2), -(85/6)^(1/2) }
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