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x in (-oo:+oo)
-x/(-2) < -5 // + 5
5-x/(-2) < 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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