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x in (-oo:+oo)
(6/7)*x-3 < 6-((1/7)*x) // - 6-((1/7)*x)
(6/7)*x+(1/7)*x-6-3 < 0
x-9 < 0 // + 9
x < 9
x in (-oo:9)
(-oo:9)
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