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(x^2)/5-((2*X^1)/5)-8 = 0
(-2/5)*X+(x^2)/5-8 = 0
1/5*x^2 = -(-2/5*X-8) // : 1/5
x^2 = 5*(8-(-2/5*X))
x^2 = 5*(2/5*X+8) // ^ 1/2
abs(x) = 5^(1/2)*(2/5*X+8)^(1/2)
x = 5^(1/2)*(2/5*X+8)^(1/2) or x = -(5^(1/2)*(2/5*X+8)^(1/2))
x in { 5^(1/2)*(2/5*X+8)^(1/2), -(5^(1/2)*(2/5*X+8)^(1/2)) }
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