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x in (-oo:+oo)
10 = ((5*x)/2)*x-3 // - ((5*x)/2)*x-3
3-(((5*x)/2)*x)+10 = 0
(-5/2)*x^2+3+10 = 0
-5/2*x^2 = -13 // : -5/2
x^2 = 26/5
x^2 = 26/5 // ^ 1/2
abs(x) = (26/5)^(1/2)
x = (26/5)^(1/2) or x = -(26/5)^(1/2)
x in { (26/5)^(1/2), -(26/5)^(1/2) }
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