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x in (-oo:+oo)
((4*x)/5)*x = 3 // - 3
((4*x)/5)*x-3 = 0
4/5*x^2 = 3 // : 4/5
x^2 = 15/4
x^2 = 15/4 // ^ 1/2
abs(x) = (15/4)^(1/2)
x = (15/4)^(1/2) or x = -(15/4)^(1/2)
x in { (15/4)^(1/2), -(15/4)^(1/2) }
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