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x in (-oo:+oo)
(x/5)*x-(((6*x)/2)*x)-2+3 = 0
(x/5)*x-3*x^2-2+3 = 0
-14/5*x^2 = -1 // : -14/5
x^2 = 5/14
x^2 = 5/14 // ^ 1/2
abs(x) = (5/14)^(1/2)
x = (5/14)^(1/2) or x = -(5/14)^(1/2)
x in { (5/14)^(1/2), -(5/14)^(1/2) }
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