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y in (-oo:+oo)
(2/3)*y < 36 // - 36
(2/3)*y-36 < 0
2/3*y-36 < 0 // + 36
2/3*y < 36 // : 2/3
y < 36/2/3
y < 54
y in (-oo:54)
(-oo:54)
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