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z in (-oo:+oo)
3*z-(14/(-2)) < 6 // - 6
3*z-(14/(-2))-6 < 0
3*z-6+7 < 0
3*z+1 < 0 // - 1
3*z < -1 // : 3
z < -1/3
z in (-oo:-1/3)
(-oo:-1/3)
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