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x in (-oo:+oo)
(2/3)*(z+1) = y // - y
(2/3)*(z+1)-y = 0
2/3*(z+1)-y = 0
2/3*(z+1)-y = 0
2/3*z-y+2/3 = 0
2/3*z-y+2/3 = 0
x belongs to the empty set
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