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x in (-oo:+oo)
(1/3)*x < 8-x // - 8-x
(1/3)*x+x-8 < 0
4/3*x-8 < 0 // + 8
4/3*x < 8 // : 4/3
x < 8/4/3
x < 6
x in (-oo:6)
(-oo:6)
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