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