3x+5≥-1
    5≤4-2x
    (7/18x)+1≤1/3x+8/9
    3x−1≤−2(2x−3)
    -x/4≤-8
    x^2-x-9/4>=0
    5（x-1）>(2.7+1+0.1*1.1)x+3+1.5*1.1
    x(6x+5)＜4
    （18000/(21X+1120))^2+(3000/(3500+7X))^2 <100^2
    (30000/420K)^2+(30000000/(46667K+70K^2 ))^2<100^2
    （18000/21X+1120)^2+(3000/3500+7X)^2 <100^2
    400*6a+320*4a>1840000
    a^2-4*a*(a-1)<0
    （S-11.8）/S ＞0.55
    (x+2)/2>(2x-1)/3
    10-4(x-3)<2(x-1)
    34<3x<4x^2<9706
    3x<3 x>4
    -3x-4<4x+10
    （S-6）/S ＞0.55

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