-2x<-2
    1<2a=<2
    2<=2a>1
    8
    -5x+2>=3x-16 (x-2)/6>=x/2-1
    5-2x>=3 (1-x)/4>(x+1)/2
    1 - 2 * ( x - 1 ) > 1 x/2-1/3>=x
    1-2(x-1)>1 2/x-1/3>=x
    2a-4>a+3
    (x-3)/2+3 >= x 1-3(x-1)<8-x
    x/3<(x-3)/2
    2(x-2)>5(x+1)
    510.4+128.5n＞10×（110.4-3.7n）
    1000+500x<600x+600
    5x+7-6x+6<3 5x+7-6x+6>=0
    20a+4500-15a<=5000
    15a+6000-20a<=5000
    4x-2>3x-3
    2x-8<=-2
    8÷x＞-x+2

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