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x in (-oo:+oo)
(-3/5)*x^2 = -5 // + 5
(-3/5)*x^2+5 = 0
-3/5*x^2 = -5 // : -3/5
x^2 = 25/3
x^2 = 25/3 // ^ 1/2
abs(x) = (25/3)^(1/2)
x = (25/3)^(1/2) or x = -(25/3)^(1/2)
x in { (25/3)^(1/2), -(25/3)^(1/2) }
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