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x in (-oo:+oo)
((-431*x)/40)*x = -10 // + 10
((-431*x)/40)*x+10 = 0
-431/40*x^2 = -10 // : -431/40
x^2 = 400/431
x^2 = 400/431 // ^ 1/2
abs(x) = (400/431)^(1/2)
x = (400/431)^(1/2) or x = -(400/431)^(1/2)
x in { (400/431)^(1/2), -(400/431)^(1/2) }
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