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-0.666....=-(6-0)/9=-6/9=-2/3
Y * (³√-1/27) = (√1-(3)/4 )* (-2/9 - 2/3)
Y=[( √1-(3)/4)(-2/9 -2/3)] / (³√-1/27)
Y=(1/2)(-8/9)/(-1/3)
Y= (-4/9) / (- 1/3)
Y=4/3