60 * 5500 + 5000 * ( x - 60 ) ≥550000
    60*5500+5000*（x-60）≥55000
    x+((3-2x)/2)<1-((x+2)/6)
    100/240+x/240-x/280≥0.6
    2 X-7>3(X-1)
    10x+15（350-x）*80%≤4000
    55x+40（100-x）≤5000
    28x+52（30-x）≤980
    -4082750+3000000-450000+A-A*10%/4≥300000
    -4082750+3000000-450000+A-A*10%/4≥300000
    1＜-(3p-9/5)≤2
    1＜-3p-9/5≤2
    3(x+2)>2(x+3)
    x+4<4
    2(2x-1)>5(x+1)
    1+2x>3(x-1)
    (x-3)/2>=x-2
    x-42≥312-3x＞6
    0.5*100*1.9+0.50*x*2.02-100-x>0 0.51*100*1.9+0.49*x*2.02-100-x>0 0.52*100*1.9+0.48*x*2.02-100-x>0 0.53*100*1.9+0.47*x*2.02-100-x>0
    0.5*100*1.9+0.50*x*2.02-100-x>0 0.5*100*1.9+0.50*x*2.02-100-x>0 0.51*100*1.9+0.49*x*2.02-100-x>0 0.52*100*1.9+0.48*x*2.02-100-x>0 0.53*100*1.9+0.47*x*2.02-100-x>0 0.54*100*1.9+0.46*x*2.02-100-x>0 0.55*100*1.9+0.45*x*2.02-100-x>0

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