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z in (-oo:+oo)
(1/3)*z < 5 // - 5
(1/3)*z-5 < 0
1/3*z-5 < 0 // + 5
1/3*z < 5 // : 1/3
z < 5/1/3
z < 15
z in (-oo:15)
(-oo:15)
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