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x in (-oo:+oo)
4*x = (4/3)*x^2 // - (4/3)*x^2
4*x-((4/3)*x^2) = 0
(-4/3)*x^2+4*x = 0
4*x-4/3*x^2 = 0
DELTA = 4^2-(-4/3*0*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)-4)/(-4/3*2) or x = (-16^(1/2)-4)/(-4/3*2)
x = 0 or x = 3
x in { 0, 3 }
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