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z in (-oo:+oo)
3*z-(2/3) = 6 // - 6
3*z-(2/3)-6 = 0
3*z-2/3-6 = 0
3*z-20/3 = 0 // + 20/3
3*z = 20/3 // : 3
z = 20/3/3
z = 20/9
z = 20/9
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