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x in (-oo:+oo)
(X^2)/3 = 4*x-15 // - 4*x-15
(X^2)/3-(4*x)+15 = 0
(X^2)/3-4*x+15 = 0
1/3*X^2-4*x+15 = 0 // - 1/3*X^2+15
-4*x = -(1/3*X^2+15) // : -4
x = (-(1/3*X^2+15))/(-4)
x = (1/3*X^2+15)/4
x = (1/3*X^2+15)/4
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