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z in (-oo:+oo)
((3*z-2)^2)/3 = ((8*z)^1)/3 // - ((8*z)^1)/3
((3*z-2)^2)/3-(((8*z)^1)/3) = 0
((3*z-2)^2)/3+(-8/3)*z = 0
((3*z-2)^2)/3+(-8*z)/3 = 0
(3*z-2)^2-8*z = 0
9*z^2-20*z+4 = 0
9*z^2-20*z+4 = 0
9*z^2-20*z+4 = 0
DELTA = (-20)^2-(4*4*9)
DELTA = 256
DELTA > 0
z = (256^(1/2)+20)/(2*9) or z = (20-256^(1/2))/(2*9)
z = 2 or z = 2/9
(z-2/9)*(z-2) = 0
((z-2/9)*(z-2))/3 = 0
((z-2/9)*(z-2))/3 = 0 // * 3
(z-2/9)*(z-2) = 0
( z-2/9 )
z-2/9 = 0 // + 2/9
z = 2/9
( z-2 )
z-2 = 0 // + 2
z = 2
z in { 2/9, 2 }
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