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z in (-oo:+oo)
(-4/11)*z-1 > 6/7 // - 6/7
(-4/11)*z-(6/7)-1 > 0
(-4/11)*z-6/7-1 > 0
-4/11*z-13/7 > 0 // + 13/7
-4/11*z > 13/7 // : -4/11
z < 13/7/(-4/11)
z < -143/28
z in (-oo:-143/28)
(-oo:-143/28)
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