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z in (-oo:+oo)
(5/6)*(2*z-1) < 3 // - 3
(5/6)*(2*z-1)-3 < 0
5/6*(2*z-1)-3 < 0
5/6*(2*z-1)-3 < 0
5/3*z-23/6 < 0
5/3*z-23/6 < 0
5/3*z-23/6 < 0 // + 23/6
5/3*z < 23/6 // : 5/3
z < 23/6/5/3
z < 23/10
(-oo:23/10) (23/10:+oo) 5/3*z-23/6 - +
z in (-oo:23/10)
(-oo:23/10)
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