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x in (-oo:+oo)
(2/3)*x-4 < 4 // - 4
(2/3)*x-4-4 < 0
2/3*x-8 < 0 // + 8
2/3*x < 8 // : 2/3
x < 8/2/3
x < 12
x in (-oo:12)
(-oo:12)
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