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x in (-oo:+oo)
(13/4)*x^2-(12*x) = 0
(13/4)*x^2-12*x = 0
13/4*x^2-12*x = 0
DELTA = (-12)^2-(0*13/4*4)
DELTA = 144
DELTA > 0
x = (144^(1/2)+12)/(2*13/4) or x = (12-144^(1/2))/(2*13/4)
x = 48/13 or x = 0
x in { 0, 48/13 }
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