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x in (-oo:+oo)
((-5*x^1)/2)*x = -4 // + 4
((-5*x^1)/2)*x+4 = 0
((-5*x)/2)*x+4 = 0
-5/2*x^2 = -4 // : -5/2
x^2 = 8/5
x^2 = 8/5 // ^ 1/2
abs(x) = (8/5)^(1/2)
x = (8/5)^(1/2) or x = -(8/5)^(1/2)
x in { (8/5)^(1/2), -(8/5)^(1/2) }
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