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x in (-oo:+oo)
-12 > 8-((4/3)*x) // - 8-((4/3)*x)
(4/3)*x-12-8 > 0
4/3*x-20 > 0 // + 20
4/3*x > 20 // : 4/3
x > 20/4/3
x > 15
x in (15:+oo)
(15:+oo)
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