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x in (-oo:+oo)
(1/4)*x^2-(3/5) = 5/7 // - 5/7
(1/4)*x^2-(3/5)-(5/7) = 0
(1/4)*x^2-3/5-5/7 = 0
1/4*x^2 = 46/35 // : 1/4
x^2 = 184/35
x^2 = 184/35 // ^ 1/2
abs(x) = (184/35)^(1/2)
x = (184/35)^(1/2) or x = -(184/35)^(1/2)
x in { (184/35)^(1/2), -(184/35)^(1/2) }
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