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x in (-oo:+oo)
1-(x/2) > 4 // - 4
1-(x/2)-4 > 0
-1/2*x-3 > 0 // + 3
-1/2*x > 3 // : -1/2
x < 3/(-1/2)
x < -6
x in (-oo:-6)
(-oo:-6)
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