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