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x in (-oo:+oo)
504*x-((12/6)*x^2) = 0
504*x-2*x^2 = 0
504*x-2*x^2 = 0
DELTA = 504^2-(-2*0*4)
DELTA = 254016
DELTA > 0
x = (254016^(1/2)-504)/(-2*2) or x = (-254016^(1/2)-504)/(-2*2)
x = 0 or x = 252
x in { 0, 252 }
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