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