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x in (-oo:+oo)
(X^2)/3 = 5*x-20 // - 5*x-20
(X^2)/3-(5*x)+20 = 0
(X^2)/3-5*x+20 = 0
1/3*X^2-5*x+20 = 0 // - 1/3*X^2+20
-5*x = -(1/3*X^2+20) // : -5
x = (-(1/3*X^2+20))/(-5)
x = (1/3*X^2+20)/5
x = (1/3*X^2+20)/5
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