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y in (-oo:+oo)
(1/3)*y-5 < 1 // - 1
(1/3)*y-5-1 < 0
1/3*y-6 < 0 // + 6
1/3*y < 6 // : 1/3
y < 6/1/3
y < 18
y in (-oo:18)
(-oo:18)
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