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z in (-oo:+oo)
3*z-(2/(-5)) < 6 // - 6
3*z-(2/(-5))-6 < 0
3*z+2/5-6 < 0
3*z-28/5 < 0 // + 28/5
3*z < 28/5 // : 3
z < 28/5/3
z < 28/15
z in (-oo:28/15)
(-oo:28/15)
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