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