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x in (-oo:+oo)
(3/7)*x-4 < 8 // - 8
(3/7)*x-8-4 < 0
3/7*x-12 < 0 // + 12
3/7*x < 12 // : 3/7
x < 12/3/7
x < 28
x in (-oo:28)
(-oo:28)
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