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z in (-oo:+oo)
5/7-((6/7)*z) < 2/7 // - 2/7
5/7-((6/7)*z)-(2/7) < 0
(-6/7)*z+5/7-2/7 < 0
3/7-6/7*z < 0 // - 3/7
-6/7*z < -3/7 // : -6/7
z > -3/7/(-6/7)
z > 1/2
z in (1/2:+oo)
(1/2:+oo)
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