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x in (-oo:+oo)
5 = ((3*x)/2)*x // - ((3*x)/2)*x
5-(((3*x)/2)*x) = 0
(-3/2)*x^2+5 = 0
-3/2*x^2 = -5 // : -3/2
x^2 = 10/3
x^2 = 10/3 // ^ 1/2
abs(x) = (10/3)^(1/2)
x = (10/3)^(1/2) or x = -(10/3)^(1/2)
x in { (10/3)^(1/2), -(10/3)^(1/2) }
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