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x in (-oo:+oo)
(2/3)*x = (3/4)*x^2 // - (3/4)*x^2
(2/3)*x-((3/4)*x^2) = 0
(-3/4)*x^2+(2/3)*x = 0
2/3*x-3/4*x^2 = 0
DELTA = (2/3)^2-(-3/4*0*4)
DELTA = 4/9
DELTA > 0
x = ((4/9)^(1/2)-2/3)/(-3/4*2) or x = (-(4/9)^(1/2)-2/3)/(-3/4*2)
x = 0 or x = 8/9
x in { 0, 8/9 }
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