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X in (-oo:+oo)
8*X-((4/3)*X^2) = 0
(-4/3)*X^2+8*X = 0
8*X-4/3*X^2 = 0
DELTA = 8^2-(-4/3*0*4)
DELTA = 64
DELTA > 0
X = (64^(1/2)-8)/(-4/3*2) or X = (-64^(1/2)-8)/(-4/3*2)
X = 0 or X = 6
X in { 0, 6 }
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