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y in (-oo:+oo)
(1/3)*y-2 < 4 // - 4
(1/3)*y-4-2 < 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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