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z in (-oo:+oo)
(2/3)*z+z = 2/3 // - 2/3
(2/3)*z+z-(2/3) = 0
(2/3)*z+z-2/3 = 0
5/3*z-2/3 = 0 // + 2/3
5/3*z = 2/3 // : 5/3
z = 2/3/5/3
z = 2/5
z = 2/5
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