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x in (-oo:+oo)
3*x-(8/7) > 1 // - 1
3*x-(8/7)-1 > 0
3*x-8/7-1 > 0
3*x-15/7 > 0 // + 15/7
3*x > 15/7 // : 3
x > 15/7/3
x > 5/7
x in (5/7:+oo)
(5/7:+oo)
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