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