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1/2*(x-1/2(x+1))≤2/5(x-1) 1/2*(x-1/2x-1/2)≤2/5(x-1) 1/2*(1/2x-1/2)≤2/5(x-1) 1/4*(x-1)≤2/5(x-1) -3/20*(x-1)≤0 x-1≥0 x≥1
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