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x in (-oo:+oo)
(5/2)*x-5 = 12*x^2+4*x // - 12*x^2+4*x
(5/2)*x-(12*x^2)-(4*x)-5 = 0
(5/2)*x-12*x^2-4*x-5 = 0
-12*x^2-3/2*x-5 = 0
DELTA = (-3/2)^2-(-12*(-5)*4)
DELTA = -951/4
DELTA < 0
x belongs to the empty set
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