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x in (-oo:+oo)
1/2 < 2*x-(4/8) // - 2*x-(4/8)
1/2-(2*x)+4/8 < 0
1/2-2*x+4/8 < 0
1-2*x < 0 // - 1
-2*x < -1 // : -2
x > -1/(-2)
x > 1/2
x in (1/2:+oo)
(1/2:+oo)
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