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y in (-oo:+oo)
(1/3)*y < 12 // - 12
(1/3)*y-12 < 0
1/3*y-12 < 0 // + 12
1/3*y < 12 // : 1/3
y < 12/1/3
y < 36
y in (-oo:36)
(-oo:36)
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