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x in (-oo:+oo)
(3/7)*x-(5/7) >= 0
(3/7)*x-5/7 >= 0
3/7*x-5/7 >= 0 // + 5/7
3/7*x >= 5/7 // : 3/7
x >= 5/7/3/7
x >= 5/3
x in <5/3:+oo)
<5/3:+oo)
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