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x in (-oo:+oo)
(1/2)*x < 4*x-(5/7) // - 4*x-(5/7)
(1/2)*x-(4*x)+5/7 < 0
(1/2)*x-4*x+5/7 < 0
5/7-7/2*x < 0 // - 5/7
-7/2*x < -5/7 // : -7/2
x > -5/7/(-7/2)
x > 10/49
x in (10/49:+oo)
(10/49:+oo)
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