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x in (-oo:+oo)
(3/5)*x^2-8 = 26 // - 26
(3/5)*x^2-26-8 = 0
3/5*x^2 = 34 // : 3/5
x^2 = 170/3
x^2 = 170/3 // ^ 1/2
abs(x) = (170/3)^(1/2)
x = (170/3)^(1/2) or x = -(170/3)^(1/2)
x in { (170/3)^(1/2), -(170/3)^(1/2) }
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